| A | B |
|---|
| stored energy | potential energy |
| energy in petrol | chemical energy |
| stored energy in a stretched elastic band | strain energy |
| energy stored in atoms | nuclear energy |
| anything which can move downwards contains | gravitational potential energy |
| unit to measure energy | joule |
| something that changes energy | machine |
| an electric current is | a flow of electrons |
| a cell | pushes electrons |
| components | bulbs/ motors |
| measure of how much energy cell gives to current | voltage |
| voltage is measured by | a voltmeter |
| voltage is measured in | volts |
| voltmeters should be connected | in parallel |
| voltage across components= | voltage across the cell |
| mains electricity | 230v |
| number of joules used per second | power rating |
| units of power | watts |
| one unit | one kilowatt- hour |
| energy is generated in | power stations |
| cables that take electricity all over the country | national grid |
| fossil fuels are | non renewable |
| heat energy is usually | waste energy |
