CAIE IGCSE Physics 4.2.2.1 Electric Current Is Related to the Questions

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 I = Q/t, calculate current, charge or time from I = Q/t with consistent units, and explain current between a charged sphere and Earth through electron attraction or potential difference.

[Maximum number: 1]

A circuit contains two fixed resistors and a light-dependent resistor (LDR). Fig. 8.1 shows that the power supply is a 9.0 V battery.

Fig. 8.1

The current in the $450 \Omega$ resistor is 0.012 A .

State what is meant by electric current.

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CAIE IGCSE Physics 4.2.2.1 Electric Current Is Related to the Questions question 1