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Electricity
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Electricity exam notes for iGCSE
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elsamompoalbiana
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define electricityflow of energy or charge between charged particles either statically or in a circuit.
units of measuring electricity
UNIT MEASURES UNIT MEASURES UNIT MEASURES
Volts (V) voltage Coulomb (C) charge Joule (J) energy
Amps (A) current Second (S) time
Ohm (Ω) resistance (slows down flow) Watt (W) power
mains electricity from a battery / power supply.
DIRECT CURRENT ALTERNATING CURRENT
Electric current that always flows in one direction Electric current that is constantly changing direction.
(produced by cells and batteries)
-Circuits (e.g. in computers) need d.c. electricity in -produced by most generators and is used in mains
order to work. electricity.
-cannot be transferred efficiently over large distances. -can be transferred efficiently over large distances.
electrical safety
insulators job double insulation how fuses+circuit breakers protect circuits
material that doesn’t -electrical appliance with 2 -prevent overloads that can cause fire
let heat / electricity insulations: -quickly interrupt flow of fire
travel through easily (basic + supplementary) -when they melt: need replacement / reset.
-protection against shock
FUSE CIRCUIT BREAKER
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