Circuit symbols
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14 Terms
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Switch (open)
Used to turn a circuit off
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Switch (closed)
Used to turn a circuit on
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Cell (electrical)
Provides the energy for a circuit
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Battery
Two or more cells connected together
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Diode
A device that allows current to flow in one direction only
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Resistor (fixed)
A device that restricts or limits the flow of current
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Variable resistor
A device that has a slider which can be moved to change the resistance
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LED (light-emitting diode)
A diode which emits light and is much more efficient than a filament bulb
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Lamp (filament bulb)
A device containing a filament in a bulb that heats up when a current flows so that it emits light
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Fuse
A safety device consisting of a strip of wire that melts, breaking an electric circuit, if too much current passes through it
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Voltmeter
A device placed in parallel with a component to measure the potential difference (voltage) across it
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Ammeter
A device placed in series with a component to measure the current through it
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Thermistor
A device whose resistance decreases as the surrounding temperature increases
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LDR (light-dependent resistor)
A device whose resistance decreases as the surrounding light intensity increases
Note 
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