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9I Electricity @AJHS
Electricity section of 9I energy and electricity
| Question | Answer |
|---|---|
| atomic energy | Another name for nuclear energy. |
| cell | It contains a store of chemical energy that can produce electricity (the scientific name for a battery). |
| chemical energy | The kind of energy stored in chemicals. Food, fuel and cells (batteries) all contain chemical energy. |
| electrical energy | The kind of energy carried by electricity. |
| energy flow diagram | A way of showing energy changes as a flow chart. |
| gravitational | The kind of energy stored by anything that can fall down. |
| potential energy | |
| heat energy | The hotter something is the more heat energy it has. |
| joule (J) | The unit for measuring energy. |
| kilojoule (kJ) | There are 1000 joules (J) in 1 kilojoule (kJ). |
| kinetic energy | The kind of energy in moving things. |
| light energy | The kind of energy given out by light bulbs, candles, etc. |
| machine | Something that changes energy from one form to another. |
| nuclear energy | Energy stored inside atoms. |
| potential energy | The scientific word for ‘stored’ energy. |
| sound energy | The kind of energy that is made by anything that is making a noise. |
| strain energy | The kind of energy stored in stretched or squashed things which can change back to their original shapes. |
| transfer | When energy is changed from one form into another we say it is transferred. |
| ammeter | Measures how much electricity is flowing around a circuit. |
| cell | It contains a store of chemical energy that can produce electricity (the scientific name for a battery). |
| current | The flow of electrons around a circuit. |
| electron | Tiny particle that flows around a circuit. |
| in parallel | A circuit is in parallel when the current divides, a part going through each component, then joins up to complete the circuit. |
| model | A scientific way of thinking about how things happen. |
| rechargeable | Cells that can have more energy stored in them after they have been used are said to be rechargeable. |
| resistor | A component that makes it more difficult for current to flow – resistors are used to control the size of the current in the circuit. |
| transfer | When energy is changed from one form into another we say it is transferred. |
| voltage | A way of saying how much energy is transferred by electricity. |
| voltmeter | A component that measures voltage. |
| volt (V) | The unit for voltage. |
| generate | Make electricity by turning a magnet inside coils of wire. |
| generator | Large coil of wire with a magnet inside. When the magnet is turned, electricity is produced in the coil of wire. |
| kilowatts | There are 1000 watts (W) in 1 kilowatt (kW). |
| mains electricity | Alternating current at 230 V provided to houses, shops, etc. |
| National Grid | System of overhead and underground cables that carry electricity around the country. |
| power rating | The number of joules of energy an appliance uses every second. |
| turbine | A machine that is turned by a moving liquid or gas. Turbines are used to turn generators in power stations. |
| watt (W) | The unit for measuring power. One watt is one joule per second. |
| efficiency | A way of saying how much energy something wastes. |
| law of conservation | The idea that energy can never be created or destroyed, only changed from one form of energy to another. |
| wasted energy | Energy that is not useful. |
Created by:
johncl
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