2.11 describe how current varies with voltage in wires, resistors, metal filament lamps and diodes, and how this can be investigated experimentally

Wire (1)  – A wire would have the graph of a fixed gradient – there is very little change in resistance of a wire.

Filament lamp (2) – The resistance of the metal within the lamps increases with temperature. The curve of the gradient on a Filament lamp (current x voltage graph) would show that the lamp is reaching it’s working current.

Diodes (3) – The voltage increases as resistance decreases. Semiconductor diodes only allows current to flow in one way (forward)unit_22.gif

(Reminder that potential difference is voltage)

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