2 2 of 44 Contents Renewable Energy Solar power Wind power Water power Thermal power Summary activities
3 3 of 44 Solar cells Solar cells (or photocells) turn light energy from the Sun directly into direct current electricity. Manufacturing solar cells is very expensive and requires the use of highly toxic materials. However, once the solar cell is built it produces no pollution and requires little maintenance. This makes solar cells ideal for use in remote locations where maintenance is difficult and other sources of electricity would be expensive. NASA/NREL
4 4 of 44 How do solar cells work?
5 5 of 44 Efficiency of a solar cell Solar cells suffer from a low efficiency. This is because only light with enough energy causes an electron to be released which is only about 25% of all sunlight. The amount of electricity a solar panel can produce depends on two factors: its surface area and the light intensity. Producing enough electricity to power a town would require a very large area of solar panels but covering the roof of a house can meet the annual electricity needs of the household.
6 6 of 44 Problems with solar cells One obvious problem with solar cells is that they do not produce electricity at night. If more electricity is produced during the day than is used, the excess can be used to charge a battery which can then provide power during the night. Warren Gretz/NREL Scientists are working to develop improved solar cells which require less polluting chemicals in their manufacture, cost less to produce and are more efficient than the current technology.
7 7 of 44 Effective use of solar cells Solar cells can be used very effectively in the right situation. The robust nature of solar panels can be exploited in remote areas where maintenance is difficult. The Dangling Rope Marina on Lake Powell in Utah, USA, is only accessible by water. It previously depended on more than 246,000 litres of diesel to fuel its generators. A photovoltaic energy system has now been installed. It will reduce the cost of providing electricity and is clean, quiet and dependable. Sandia National Laboratory/NREL Warren Gretz/NREL
8 8 of 44 Effective use of solar cells Solar cells are very useful for remote locations where supplying mains electricity would be expensive. This solar-powered street light is in a remote part of mid-wales with no mains electricity supply close by. The use of solar power in this way removes the need to lay electricity cables to the light, which is another benefit to the environment.
9 9 of 44 Effective use of solar cells Solar cells are very useful where the light intensity is highest. These solar panels are in a remote part of Morocco where they are used by a local utility company. Courtesy of BP Solarex/NREL Solar cells are also useful where low amounts of power are needed. Calculators only require a small amount of electricity, so most calculators now use solar cells in place of batteries.
10 10 of 44 Pros and cons of solar cells
11 11 of 44 Solar power stations Solar power stations use the energy from the sun to heat water to make steam, which is then used to drive a turbine. Some solar power stations use a series of mirrors called heliostats to reflect light onto a boiler. Sandia National Laboratory/NREL This solar power station in California consists of about 1800 heliostats, with an electrical output of 10 megawatts.
12 12 of 44 Effective use of solar power stations Solar power stations are most effectively located in areas with high light intensity. This test design is located in Arizona where the sunlight is intense and the air temperature is high. The mirrors must track the Sun as it moves across the sky to be efficient as possible, Would this sort of power station be effective in the UK? Bill Timmerman/NREL
13 13 of 44 More solar power stations Some solar power stations use curved mirrors which focus the Sun s energy onto pipes containing water. This heats the water forming steam. Warren Gretz/NREL Warren Gretz/NREL
14 14 of 44 Contents Renewable energy Solar power Wind power Water power Thermal power Summary activities
15 15 of 44 Wind power Wind is the result of the Sun heating the Earth and creating convection currents in the Earth s atmosphere. Using the wind as a source of energy is not a new idea. Sailing ships, powered by the wind, have been around for thousands of years. Windmills which used the wind s power to grind corn were once a common landmark across Britain.
16 16 of 44 Wind turbines Wind turbines (or aerogenerators) use large blades to capture the kinetic energy of the wind. This kinetic energy is used to directly turn a turbine and produce electricity. Wind turbines do not produce any polluting waste, however, some people consider them to be an noisy and an eyesore. There is also concern that, if poorly located, they could kill migrating birds.
17 17 of 44 Wind farms One problem with wind turbines is that individually they do not generate a lot of electricity. They are usually needed in large numbers to have an impact on electricity production. A group of wind turbines is called a wind farm. Robert Thresher/NREL Wind farms require large amounts of space in open areas, but the land can also be used for farming at the same time. Offshore wind farms are located at sea. This wind farm is located 10 kilometres from the south-east coast of Ireland.
18 18 of 44 Effective use of wind turbines The energy produced by a wind turbine depends on the wind speed. If it is not windy, electricity is not produced, so wind turbines are not a reliable source of electricity. To be effective, wind turbines need to be located in windy areas. Unfortunately, these are usually upland areas of natural beauty and some people object to the building of wind farms in these areas. Wind power can be used effectively in remote locations to charge batteries which can then be used to provide a constant supply of electricity.
19 19 of 44 The then and now guide to wind power How has the use of wind power changed over time?
20 20 of 44 Wind power true or false?
21 21 of 44 Contents Renewable energy Solar power Wind power Water power Thermal power Summary activities
22 22 of 44 Water power 1: hydroelectric power The power of flowing water has been used for hundreds of years to operate machinery. This power can also be used to generate electricity.
23 23 of 44 Hydroelectric power Large scale hydroelectric schemes involve building a dam across the end of a river valley to create a reservoir. This is done high up in a mountainous area. Hydroelectric power stations are able to start up electricity production quickly. Hydroelectric power is also very reliable.
24 24 of 44 Hydroelectric power station
25 25 of 44 Effective use of hydroelectric power Hydroelectric power stations need to be situated in high mountainous areas such as North Wales or Scotland. Damming the river causes the river valley to flood which could mean that houses and villages are destroyed. Hydroelectric power schemes also cost a lot of money and take a long time to build. However, they do last a long time and they are able to produce large amounts of electricity. Once they are built, hydroelectric schemes provide a cheap and reliable source of electricity.
26 26 of 44 The then and now guide to water power How has the use of water power changed over time?
27 27 of 44 Pros and cons of hydroelectric power
28 28 of 44 Water power 2: wave power The rise and fall of waves is a renewable source of energy. Effective sites for harnessing wave energy need to have strong waves most of the time, to ensure that enough electricity will be produced. The Limpet (land-installed marine-powered energy transformer) on Islay, Scotland, is the world s first commercial wave energy device. Its low profile is designed so that it does not effect coastal views.
29 29 of 44 How does wave power work?
30 30 of 44 Water power 3: tidal power Tidal power involves building a dam across a river estuary. Water can only flow in and out of the estuary through turbines in the dam, which harness the tidal energy. Tidal power is able to provide a lot of electricity, however building a tidal barrage is very expensive. When a tidal barrage is built, it results in some of the estuary being flooded. This can mean the loss of important habits for wading birds.
31 31 of 44 How does tidal power work?
32 32 of 44 Effective use of tidal power Tidal power provides a regular source of electricity. Exactly when this electricity will be produced is governed by the tides, which depend on the Moon. Monthly variations in the tidal range will also affect how much electricity can be produced. The passage of ships past the tidal barrier and the effect on wildlife also complicate the construction of tidal barrage schemes.
33 33 of 44 Pros and cons of tidal power
34 34 of 44 Contents Renewable energy Solar power Wind power Water power Thermal power Summary activities
35 35 of 44 Biomass Biomass is material from living sources. The simplest biomass energy sources are plants which can be burnt to produce steam to turn a turbine. Traditionally, wood is burnt to give heat but trees grow slowly and require a lot of land. Other materials such as the waste from chicken farms can also be burnt. Biomass fuels are renewable as more plants can be grown, producing yet more biomass. Biomass fuels do not contribute to global warming as the carbon dioxide released when they are burnt is absorbed by the plants grown to replace them.
36 36 of 44 Biofuels Some sources of biomass energy are further processed to produce more valuable biofuels. Some plants can be fermented to give ethanol, a biofuel, which can be used instead of petrol or even aviation fuel, as in this plane! Laurent Simon - Aviation & Pilot/NREL California Polytechnic State University/NREL Methane is biogas which can be used a replacement for natural gas. It is produced in anaerobic digesters by rotting animal waste and often found on remote farms, such as this digester on a pig farm.
37 37 of 44 The then and now guide to biomass How has the use of biomass changed over time?
38 38 of 44 Geothermal energy In rocks under the ground, radioactive decay of elements, such as uranium, releases heat energy that warm the rocks. In some areas, hot water and steam rise to the surface. Joel Renner - DOE/NREL The steam and hot water which rises naturally to the surface can be harnessed to generate electricity. David Parsons/NREL The largest geothermal power plant is in California and has an output of 750 megawatts.
39 39 of 44 Geothermal energy In some areas, the warm rocks are very deep underground. Where this occurs, wells are drilled down to the hot rocks and cold water is pumped down. The water is heated by the rocks and returns to the surface as steam. This geothermal power plant in California has 57 wells and produces 52 MW of electricity. Warren Gretz/NREL
40 40 of 44 Pros and cons of geothermal energy
41 41 of 44 Contents Renewable energy Solar power Wind power Water power Thermal power Summary activities
42 42 of 44 Glossary biomass energy Energy from living matter, which can used as fuels. geothermal energy Heat from radioactive decay in rocks deep below the Earth s surface. hydroelectric energy The gravitational potential energy of falling water, which is used to generate electricity. solar energy Energy from the Sun, which is converted into thermal or electrical energy. tidal energy Energy from the rise and fall of the tides, which can be used to generate electricity. wave energy Energy from the up and down motion of waves, which can be used to generate electricity. wind energy Energy from the movement of air, which is transferred to wind turbine and used to generate electricity.
Most solar panels installed on houses in the last few years convert the energy of sunlight directly into electrical energy. These are photovoltaic cells. Solar panels 3 This electricity can be used around
Earth s Energy Resources: GeothermaL Geothermal energy comes from heat deep under the ground. This energy is produced in the core of the Earth. The heat from the core can melt rock into magma. The magma
Activity 3 Information sheet Type of energy Solar Where is it from Energy from sunlight is caught in solar panels and turned into electricity. Advantages The sun will always be there during our lifetime.
Work If a builder is lifting up a stone, we say that he is doing work. Similarly, you would be doing work when you carry your school bag up a flight of steps to your classroom. Work is done when a force
Energy What is energy? - Ability to do WORK - The transfer of energy is work, power is the rate at which energy is transferred. - There are many forms of energy (chemical, mechanical, nuclear, thermal,
Section 1: Renewable Energy Today Preview Bellringer Objectives Renewable Energy Solar Energy-Power from the Sun Passive Solar Heating Active Solar Heating Photovoltaic Cells Section 1: Renewable Energy
Energy Sources Fossil Fuels Coal, Oil and Gas are called "fossil fuels" because they have been formed from the fossilized remains of prehistoric plants and animals. They provide most of the world's total
ENERGY SOURCES FOSSIL FUELS COAL, OIL AND NATURAL GAS ARE CALLED "FOSSIL FUELS" BECAUSE THEY HAVE BEEN FORMED FROM THE FOSSILIZED REMAINS OF PREHISTORIC PLANTS AND ANIMALS. THEY PROVIDE AROUND 66% OF THE
Refresh What is non-renewable energy? What are some examples? What are some good things about renewable energy? What are some bad things about renewable energy? Renewable Energy Sources https://sites.google.com/site/sciencesvn3e/home/chapter-4-using-energy-in-our-lives
Science Texts for Close Reading Solar Energy Solar energy is a way to harness sunlight for heating or electricity. There are different ways to convert sunlight into usable energy. Concentrated solar power
Reliant on fossil fuels (coal, oil, natural gas) Those will not last forever, need to have a back up plan Using fossil fuels creates greenhouse gases, which impact climate change Renewable energy is better
Supported by A seven part series exploring the fantastic world of science. Energy is the ability to do work. Light Motion (kinetic) Heat Electrical Energy can be found in different forms. Chemical Sound
CHAPTER - 14 SOURCES OF ENERGY PREPARED BY NIKHIL V JONES 1) Characteristics of a good source of fuel :- i) It should have a high energy output per unit mass or volume. ii) It should be easily available.
RENEWABLE ENERGY IN THE PACIFIC NORTHWEST Renewable energy comes from natural sources that are continually and sustainably replenished such as the sun, the flow of water, or other natural processes. By
Generating electricity 1. You can generate electricity for use in your own home using a wind turbine fixed above the roof. (a) Wind is a renewable energy source. Which one of the following is not a renewable
Worksheet 3 Generating Electricity In most power stations, electricity is generated by burning fuels. Coal, oil and natural gas are the common fuels for generating electricity. Major parts of a power station
Introduction Day 5: Energy (Greener) Before stating three alternative sources of energy and give their advantages and disadvantages, I believe I should say what is an alternative source of energy for me
Overview of renewable energy Outline What is renewable energy? Renewable energy sources Renewable energy technologies: - Characteristics - Uses What is renewable energy? Energy that doesn t run out! Energy
ENERGY 1: RESOURCES Ppt. by Robin D. Seamon Types of Energy Energy: the ability to do work (joules) (amt. of E to lift an apple 1m) Energy comes in many forms. FORMS of ENERGY: Thermal energy: energy from
Energy Solar Energy Energy Resource A natural resource that humans use to generate energy. Can be renewable are nonrenewable. energy sources are replaced by natural processes at least as quickly as they
Renewable Energy Alternatives Reasons for Alternative Energy Fossil fuels won t last forever Renewable unlikely to run out Decrease air pollution and greenhouse gas emissions Less dependent on other nations
S2 Science Physics Energy Matters Name: Experiences and Outcomes SCN 3-04a - I can use use my knowledge of different ways in which heat is transferred to improve the energy efficiency of systems. SCN 3-04b/4-04a
Chapter 18 Renewable Energy Today Renewable Energy energy from a source that is constantly being reformed. Many governments are planning to increase their use of renewable energy resources. This will reduce
Alternative Energy 1. Solar 2. Biofuels (biomass) 3. Nuclear a. Fusion b. Fission 4. Fuel Cells 5. Wind 6. Hydroelectric 7. Geothermal 8. Tidal (wave power) Solar Energy Solar energy uses energy from the
GOOD SOURCE OF ENERGY 1. a good source of energy would be one large amount of work per unit volume or mass, easily accessible, (iii) easy to store and transport, and (iv) economical. 2. We can classify
Ch 13 Achieving Energy Sustainability Module 38 Biomass and Water Module 39 Solar, Wind, Geothermal, and Hydrogen 4/16/18 Variation in Solar Radiation Potential Active Solar Energy captured from sunlight
Biomass Description of biomass: Description of photosynthesis: Ways we turn biomass into energy we can use: Who uses biomass and for what purposes: Effect of using biomass on the environment: Important
Chapter 13 Achieving Energy Sustainability Module 37 Conservation, Efficiency, and Renewable Energy After reading this module you should be able to describe strategies to conserve energy and increase energy
1 4th Grade Energy and Natural Resources 2015 11 18 www.njctl.org 2 Energy and Natural Resources Human Energy Use Click on the topic to go to that section Renewable Energy Non Renewable Energy Environmental
Check the Source! How do people use energy? Energy is the capacity to do work. People use energy to heat and cool their homes, provide light, manufacture goods, produce and prepare food, and move vehicles.
What are the 3 ways in which energy can travel? Explain what conduction is What type of materials are good conductors and what type of materials are bad conductors (good insulators)? Does conduction happen
Page 1 What type of radiation transmits heat energy? Complete this sentence Hotter objects emit infrared radiation than cooler objects. What type of surfaces are good absorbers and good emitters of infrared
Introduction to Energy Get Energized! What are two types of energy? Energy is the ability to cause change. Energy takes many different forms and causes many different effects. There are two general types
Measuring Energy: Calorie Unit to measure amount of energy in foods and fuels. One calorie = amount of heat energy needed to raise the temperature of 1 gram of water by 1 degree Celsius. Watt Unit used
Visualizing Environmental Science Renewable Energy Resources Chapter 18 Chapter 7 [chapter opener image] Copyright Reducing Heat Loss Two strategies to decrease reliance on fossil fuels Developing alternative
26 How to Re-Use and Create Renewable Energy for Creating a More Environmentally Friendly and Ecologically Sustainable City Dr. Sabina Akhtar Assistant Professor American University in the emirates (AUE)
1 Energy resources can be renewable or non-renewable. (a) Coal is a non-renewable energy resource. Name two other non-renewable energy resources. 1... 2... (b) Wind turbines are used to generate electricity.
Services and Utilities Renewable & Low Carbon Technologies An overview Recommended Reading BSRIA Illustrated Guide to Renewable Technologies. What do we mean by renewable technologies? Generating electricity
Energy generation and use MR. BANKS 7 TH GRADE SCIENCE Worldwide energy use As the world becomes more populated and technologically advanced, the demand for energy has increased. Before electricity was
I ve Got the Power! Types of Energy and how it affects our lives. Categories Energy is broken down into 2 categories RENEWABLE And NON-RENEWABLE RENEWABLE Energy that comes from a source that can be replenished
Advanced Placement ENVIRONMENTAL SCIENCE Renewable Energy STUDENT 2014 Renewable Energy The worldwide demand for energy has soared. Human population is increasing exponentially with the emergence of large
Energy is the ability to do work. Energy cannot be created or destroyed: it can only be transformed, from one type into another. Energy can be either potential or kinetic. Kinetic energy is found in anything
UNIT 10: ENERGY ISABEL CORONADO ROMERO 1. WHAT IS ENERGY? Definition: Energy is a physical quantity which produces a change or an effect Unit: International System Joule (J) Other Calorie (cal) 1cal =4,19J
What is energy? Energy is the ability to do work or change the system. What are the various sources of energy? Fossil fuels Oil (Petroleum) Propane Natural gas Coal Alternative fuels Nuclear Wind Solar
Natural Resources Renewable Energy Resources What do you think? Read the two statements below and decide whether you agree or disagree with them. Place an A in the Before column if you agree with the statement
1 ENERGY FORMS & CONVERSION 1.1 Energy sources and forms 1.2 Energy conversion 1.3 Energy storage and conservation Learning Outcomes Candidates should be able to: Knowledge, Understanding and Application
Chapter 4.2: Energy Sources Energy SOURCES OF ENERGY RENEWABLE ENERGY SOURCES Infinite supply NON-RENEWABLE ENERGY SOURCES Limited supply Part 1 Fossil Fuels NON-RENEWABLE ENERGY SOURCES FOSSIL FUELS Coal,
Renewable Energy Sources Hydroelectric power ~ 5% - 10% Solar energy - not large scale here Geothermal Energy - used in CA Wind Energy - various places (~1.3% of CA use) Tidal Power - not in US (used in
Chapter 13 Achieving Energy Sustainability Energy from the Moon Tidal energy Moon power Capture energy in moving water Clean source of energy Efficient source of energy Roosevelt Island First commercial
Chapter 13 Renewable Energy and Conservation Overview of Chapter 13 Direct Solar Energy Indirect Solar Energy Wind Biomass Hydropower Geothermal Tidal High and Low Technology Energy Solutions Direct Solar
Biomass Renewable energy source Can be quickly regrown Can be used to make ethanol, a cleaner fuel than gasoline Doesn't have as much energy as fossil fuels, so more biomass must be burned to get the same
Delhi Public School, Sonepat CLASS-10 SUBJECT-PHYSICS (SCIENCE) Chapter 14: SOURCES OF ENERGY Source of Energy: A specific source which provides useful energy. The total energy of the system is conserved
Alternative Energy Solar Power The heat from the sun can be used to heat water for use in pools and stoves. Solar power can also be used to make electricity. In California's Mojave Desert, there are huge
Uma. V Embassy Public School Contents Introduction Need for renewable energy Sources of renewable energy Advantages of renewable energy Forms of renewable energy Sun, our saviour Introduction Energy is
Chapter 13 Renewable Energy and Conservation Overview of Chapter 13 Direct Solar Energy Indirect Solar Energy Wind Biomass Hydropower Geothermal Tidal High and Low Technology Energy Solution Direct Solar
Natural Resources Mr. Dvorin Muir Middle School NONRENEWABLE AND RENEWABLE RESOURCES HMMMM... What do you think nonrenewable resources are? Break it down... Nonrenewable? Resource? NONRENEWABLE RESOURCES
RENEWABLE ENERGY SOURCES State of Renewable Energy Only 6% of energy used in U.S.; 18% of world s energy use Why so low, if most renewable energies are environmentally friendly and potentially limitless?
1 Three energy sources used to generate electricity are given in List A. Statements about the energy sources used to generate electricity are given in List B. Draw one line from each energy source in List
Energy and Global Issues Chemical reactions Reactions that release heat are exothermic Reactions that absorb heat from surroundings are endothermic The energy involved in chemical reactions is measured
Y7 Energy Summary Booklet Energy Units Energy changes are measured in joules (J) or kilojoules (kj). Energy Stores and Transfers Energy stores Key word Description Examples Magnetic The energy stored in
Sources of Electricity S C I E N C E L I N K S 9 U N I T 4 T O P I C 4. 1 B R A I N P O P S : E N E R G Y S O U R C E S N U C L E A R E N E R G Y W I N D E N E R G Y S O L A R E N E R G Y F O S S I L F
Halesworth U3A Science Group POWER FOR THE FUTURE Wind, Solar, Gas, Fusion + Storage Ken Derham Includes quotations from publicly available internet sources Wind Power. First Law of Thermodynamics Energy
ENERGY RESOURCES NONRENEWABLE RESOURCES Energy is the ability to cause change. Fossil fuels com from the remains of ancient animals. They include: petroleum, coal, and natural gas and are nonrenewable,
1 of 28 Boardworks Ltd 2016 Energy Resources Energy Resources 2 of 28 Boardworks Ltd 2016 What are energy resources? 3 of 28 Boardworks Ltd 2016 An energy resource is anything that can be used to generate
Energy Sources Characteristics of source of energy Provide adequate amount of useful energy at a steady rate over a long period of time. It should be safe & convenient to use economical & easy to store
Human Impact on Natural Systems Energy is the ability to do work. While energy surrounds us in all aspects of life, the ability to harness it and use it as constructively and as economically as possible
1 12. Natural Gas It is formed from the remains of plankton that fell to the bottom of the sea, which were changed into gases over millions of years Since natural gas is lighter than both oil and water
Renewable Energy Sources Lesson Plan: NRES F1-2 1 Anticipated Problems 1. What are renewable energy sources? 2. What are advantages and disadvantages of renewable energy sources? 2 Terms biomass biopower
Chapter 5 Notes Energy Resources Section 1 Natural Resources Describe how humans use natural resources. Compare renewable resources with nonrenewable resources. Explain three ways that humans can conserve
1a Fossil fuels (non-renewable energy) Electricity We need electricity to make lots of things work. How is electricity made? Most electricity is made in big buildings called power stations. The electricity
Information card 1 Traditional coal How was it formed? Most coal deposits were formed around 300 million years ago during the Carboniferous period. The world was covered in tropical forest then. In some
Energy Resources SECTION 25.1 Conventional Energy Resources In your textbook, read about energy resources on Earth. For each statement below, write true or false. 1. The Sun is the ultimate source of most
A. Energy changes and energy stores part 1 Energy systems and energy changes 1. Describe the energy store changes when a rocket firework is lit, goes up in the air and then falls back to the ground. (4)
This classroom activity introduces students to the context of the performance task. This ensures that students are not disadvantaged in completing the skills the task intends to assess. Contextual elements
Energy Resources Renewable Renewable resources can be replenished over fairly short spans of time, such as months, years, or decades. Nonrenewable Resources Nonrenewable resources take millions of years
Your Renewable Energy World Teacher s Guide Introduction Your Renewable Energy World is an activity booklet that teaches basic principles about the main renewable energy resources used in the world today,
Energy Transfer Exam Practice Q1. In a power station, coal can be used to generate electricity. Drayton Manor High School (a) Use words from the box to answer the questions below. chemical electrical gravitational
Course Syllabus Introduction to Renewable Technologies Course Description Interested in transforming energy? With concerns about climate change and growing populations effects on traditional energy supplies,
Energy Resources Classification Types Renewable Non renewable Sustainable Types of energy sources Renewable Wind Wave Solar Hydro-power Fuel-cells Biofuels: biomass, biodiesel, methane from organic waste,
A. Energy changes and energy stores part 1 Energy systems and energy changes 1. Describe the energy store changes when a rocket firework is lit, goes up in the air and then falls back to the ground. (4)
Energy Source Uses Biomass Uses: produce heat to manufacture products, candles, fireplaces, and campfires, woodstoves, fireplaces, and campfires, ethanol and gasohol for vehicles, waste to energy and co
APES Chapter 13 Achieving Energy Sustainability Intro: Energy from the Moon? Would / Does tidal power work? How does it work? In what ways is tidal power an improvement on wind and solar power? What are
Major types of fossil fuels; their global distribution, and for how long the resources are expected to last. Major types of heat engines: piston steam, steam turbine, gas turbine, gasoline engine, Diesel
What Lies Beneath? Do deposits of oil or natural gas lie deep beneath this section of the ocean? The owners of these exploration rigs hope so. These rigs are used to drill small test wells in the ocean
Alternating current Also known as AC power, alternating current is electricity that reverses direction within a circuit. The electricity we use in our homes does this 120 times per second. Appliances Devices