Cambridge A-Level · Physics

Current electricity

9 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 9 questions

A heater of resistance $6 Ω$ is connected to a $12 V$ supply. What is the power consumed (in W)?
A potential divider is made from a $12 V$ supply (negligible internal resistance), a $4.0 k Ω$ resistor and a $2.0 k Ω$ resistor in series. A $6.0 k Ω$ load…
A cell is connected across a $4.0 Ω$ resistor and the current is $1.2 A$ . When it is connected across a $7.5 Ω$ resistor instead, the current is $0.70 A$ . What is the inter…
A uniform wire has resistance $2.0 Ω$ . It is stretched evenly, without changing its volume, to $1.5$ times its original length. What is its new resistance, in ohms?
A heater of resistance $110 Ω$ is connected to a $220 V$ supply. What is the power consumed (in W)?
A heater of resistance $55 Ω$ is connected to a $110 V$ supply. What is the power consumed (in W)?
A heater of resistance $120 Ω$ is connected to a $240 V$ supply. What is the power consumed (in W)?
A heater of resistance $44 Ω$ is connected to a $220 V$ supply. What is the power consumed (in W)?
A heater of resistance $12 Ω$ is connected to a $24 V$ supply. What is the power consumed (in W)?

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