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19 Cards in this Set
- Front
- Back
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What is happening to the demand for energy? |
It is continually increasing and this raises issues about the availability of energy sources and the environmental effects of using these sources? |
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What are the main primary energy sources that humans use? |
Fossil fuels Nuclear fuels Biofuels Wind Waves Radiation from the sun |
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Why is electricity called a secondary energy source? |
Because we get it from the conversion of other sources of energy, like coal, natural gas, oil, nuclear power and other natural sources, which are called primary sources. |
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What do power stations which burn fossil fuels produce? |
They produce carbon dioxide which contributes to global warming and climate change |
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What happens when electric current is passed through a component? |
Energy is transferred from the power supply to the component and/or the environment |
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What is power of an appliance or device a measure of? |
It's a measure of the amount of energy transfered each second i.e. The rate at which it transfers energy |
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What is a joule? |
A very small amount of energy, so a domestic electricity meter measures the energy transfer in kilowatt hours |
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Why is electricity convenient? |
Because it is easily transmitted over distances and can be used in many ways |
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What is mains electricity produced by? |
Generators |
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How do generators produce a voltage across a coil of wire? |
By spinning a magnet near it |
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What is the link between the current supplied by an generator and the primary fuel it used psychology per second? |
The bugger the current supplied by an generator, the more primary fuel it uses every second |
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What is the primary energy source used for in many power stations? |
It is used to heat water and then the steam produced drives the turbine which is connected to the electrical generator |
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What type of waste do nuclear power station produce? |
Radioactive waste |
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What type of radiation does radioactive waste emit? |
Ionising radiation |
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What does increased exposure to ionising radiation cause? |
Increased damage to living cells eventually leading to cancer or cell death |
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What is the difference between irradiation and contamination? |
Contamination is where radiation give materials get into you causing you to be radioactive for a short period of time Irradiation is where the radiation hits your skin but doesn't enter you |
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What is the mains voltage supply to our homes? |
230 volts |
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How does the national grid reduce energy losses? |
They distribute electricity at high voltages |
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What 4 things doe the choice of energy source for a given situation depend on? |
1.) Environmental impact 2.) Economics 3.) Waste produced 4.) Carbon dioxide emissions |
