Physics · Unit 1 · Electrical circuits · Current, potential difference and energy flow
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A student conducted an experiment to investigate the relationship between potential difference and current for two resistors: a carbon film resistor and a 12 V filament lamp. The results are shown in the graph below. Compare the current–voltage characteristics of the two resistors.
A student constructs two circuits: one with a metal wire (resistor A) and another with a filament lamp (resistor B). Both are connected to a variable power supply. As the voltage across each resistor is increased from 0 V to 12 V, the student measures the current through each component. Compare the characteristics of the metal wire and the filament lamp in terms of their resistance as voltage increases.