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25 Cards in this Set
- Front
- Back
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The path of electricity goes from substations, to transformers, to the junction box and then where?
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outlets in homes
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Name a wave in the electromagnetic spectrum that is longer than yellow light.
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infrared
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What does nonrenewable resource mean?
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It means that the resource cannot be used over and over again
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Geothermal is what type of resource?
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renewable
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Wind is what type of resource?
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renewable
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Direct currents are changed to alternating currents to use in the homes because....
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alternating currents are more efficient
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If I install solar panels onto my home and I generate more electricity than I need, what happens to the excess energy?
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It goes back out to the power grid and to other homes and business.
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Powerful electromagnets turn inside generators and make ____________ move inside a copper wire.
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electrons
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What do photovoltaic cells do?
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used to capture photons and convert them to electrical energy
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Quantitative data deals with?
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numbers and measurements
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A packet of light energy or light particles is called a what?
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photon
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How do electromagnetic waves differ from other types of waves?
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They do not need a medium to travel through.
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What electromagnetic radiation has the longest wavelength?
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radio waves
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What electromagnetic radiation has the shortest wavelength?
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gamma
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Name an everyday object used inside the classroom that has solar panels.
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calculator
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Where is visible light located on the electromagnetic spectrum?
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Toward the middle. It represents a very small amount of the spectrum
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What determines the color of a visible light wave?
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its wavelength
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What are the parts that make hydroelectric power work?
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turbine, reservoir, dam, penstock, generator, copper wire
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What are some advantages of hydroelectricity?
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energy is virtually free once built, no pollution, energy is generated constantly, renewable
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Why is hydroelectric power considered renewable?
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The sun evaporates water from the sea and lakes, which forms clouds and falls as rain in the mountains, keeping the reservoir supplied with water.
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What happens inside the generator in a powerplant?
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The electromagnet spins, causing electrons inside a copper wire to move, which generates electricity.
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What do transformers do?
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They reduce or increase voltage so distribution lines carry power for final delivery to homes.
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How are photovoltaic cells, batteries and electromagnets similar?
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They both have a positive and negative side that causes the repelling and attracting of electrons, which generates electricity.
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Which one of these conducts electricity? Copper or plastic wire?
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copper wire
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Electricity is defined as......
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the flow of electrons
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