I–V characteristics: resistor, lamp, diode, thermistor

See how current changes with voltage for an ohmic resistor, a filament lamp, a diode and a thermistor, and read the resistance at any point.

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Questions students ask

Why is a filament lamp's I–V graph curved?

As the filament heats up its resistance rises, so the current increases less for each extra volt.

What does a diode do?

It lets current flow in one direction only, once the voltage passes about 0.6–0.7 V for silicon.

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