P3.2 Simple circuits
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16 Terms
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potential difference
the difference in electrical charge between two points in a circuit expressed in volts
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Volts
unit for voltage
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Voltmeter
A device used to measure voltage, or potential difference
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Electrical working
Energy transfer by an electric current
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Energy transferred (J) =
potential difference (V) x charge (C)
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series circuit
An electric circuit with only one path through which charge can flow
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Ammeter
a device used to measure current
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parallel circuit
A circuit that contains more than one path for current flow.
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Resistance
A material's opposition to the flow of electric current.
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Ohms
unit for resistance
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potential difference =
current x resistance
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Variable resistor
A resistor whose resistance can be changed.
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Characteristic graph
A graph of current against potential difference.
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Linear circuit unit
The resistance does not change as the potential difference changes
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Non-linear circuit element
a circuit component which has a resistance that does change
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Ohm's Law
the current in a circuit equals the voltage difference divided by the resistance
Note 
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