A wire is called an ohmic conductor because its resistance stays constant as the current changes, provided its temperature is constant.
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Card 17
Front
Reversing the potential difference across a resistor reverses the current through it.
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Card 18
Front
Resistance increases as current increases.
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Card 19
Front
In the forward direction, the line curves towards the y-axis. So the current is not directly proportional to the potential difference. The resistance changes as the current changes. A diode is a non-ohmic conductor.
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Card 20
Front
A thermistor is a temperature-dependent resistor, and its resistance decreases if its temperature increases, and increases if the temperature decreases.
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Card 21
Front
P4.5 - Series circuits
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Card 22
Front
In a series circuit, the total potential difference of the power supply is shared between the components.
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Card 23
Front
The total resistance of two (or more) components in series is equal to the sum of the resistance of each component.
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Card 24
Front
P4.6 - Parallel circuits
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Card 25
Front
For components in parallel, the potential difference across each component is the same.
