CAIE IGCSE Physics Electric Current and Charge Flow

Practise defining current as the rate of flow of electric charge and explaining charge movement through a wire when a potential difference is present.

Exam points

define electric current as the rate of flow of charge, expressed by the relationship I = Q/t
explain current between a charged sphere and Earth through electron attraction or potential difference

[Maximum number: 1]

The charge on the sphere in (b) is $+2.0 \times 10^{-5} \mathrm{C}$ . A high resistance wire is now connected between the sphere and earth. It takes 20 minutes for the sphere to become completely discharged through the wire.

Suggest why there is a current in the wire between the sphere and earth.

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4.2.2.1—Electric current is related to the question 1