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9I Electricity @AJHS

Electricity section of 9I energy and electricity

QuestionAnswer
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