An indicator: An indicator, such as a light bulb, is designed to emit light as a signal when a current passes through it.
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Card 7
Front
A light-emitting diode (LED): A light-emitting diode (LED) emits light when a current passes through it.
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Card 8
Front
A fixed resistor: A fixed resistor limits the current in a circuit.
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Card 9
Front
A fuse: A fuse is designed to melt and therefore 'break' the circuit if the current through it is greater than a certain amount.
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Card 10
Front
A voltmeter: A voltmeter is used to measure potential difference (i.e. voltage).
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Card 11
Front
Electric charge is measured in coulombs (C). Electric current is measured in amperes (A).
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Card 12
Front
charge flow, Q (coulombs, C) = current, I (amps, A) x time taken, t (seconds, s)
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Card 13
Front
An ammeter measures the current, and is connected in series with the bulb, so the current through them is the same.
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Card 14
Front
Potential difference is the energy tranferred energy transferred to the bulb or the work done on it by each coulomb of charge that passes through it, and it measured in volts, V.
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Card 15
Front
resistance, R (ohms, ) = potential difference, V (volts, V) / current, I (amperes, A).
