ESAT (Engineering and Science Admissions Test) · Physics

Electricity

11 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 11 questions

A $6 Ω$ and a $3 Ω$ resistor are connected in parallel. What is the combined resistance?
A $2 k Ω$ resistor and a $4 k Ω$ resistor are in series across a $12 V$ supply. What is the potential difference across the $4 k Ω$ resistor?
A cell of e.m.f. $6.0 V$ and internal resistance $0.5 Ω$ drives a current through an external resistor of $5.5 Ω$ . What is the terminal potential difference?
A bulb is marked $12 V$ , $24 W$ . Two such bulbs are connected in series across a $12 V$ supply. What is the total power dissipated (assume constant resistance)?
A $12 V$ supply drives a current of $3.0 A$ through a lamp for $10 s$ . How much energy is transferred?
Resistors of $4 Ω$ , $6 Ω$ and $10 Ω$ are connected in series across a $12 V$ supply. What is the current?
A $2.0 kW$ heater runs for $45$ minutes. Electricity costs $30 p$ per kWh. What is the cost?
A current of $0.50 A$ flows for $2.0$ minutes. How much charge passes?
A wire of resistance $4 Ω$ is replaced by a wire of the same material with twice the length and twice the diameter. What is the new resistance?
At a junction, $5.0 A$ flows in. Two branches carry $2.0 A$ and $1.8 A$ away, and a third branch carries the rest. What is the current in the third branch?
A $100 μ F$ capacitor is charged to $12 V$ . How much energy does it store?

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