Edexcel IGCSE Physics 2.13 Voltage Current and Resistance Questions

Rearrange voltage = current × resistance to solve unknown circuit values, including using an I–V graph to find resistance.

Exam points

state or rearrange V = I x R using standard symbols for voltage, current and resistance
calculate I, V or R from circuit values, converting mA to A or giving answers in mA
read current or voltage from a graph before substituting into V = I x R with Ω units

[Maximum number: 3]

The circuit diagram shows a light dependent resistor (LDR) and a $73 \Omega$ resistor connected in series with a 1.5 V cell.

(a)

State the formula linking voltage, current and resistance.

[ 1 ]

(b)

The current in the circuit is 7.8 mA.

Calculate the voltage across the 73 ohm resistor.

voltage = ............ V

[ 2 ]

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