CAIE A-Level Physics 10.2.4 Combined Resistance in Series

Practise calculating series equivalent resistance, current and potential difference, applying the series formula and finding the p.d. across a selected resistor.

Exam points

calculate equivalent resistance, current or p.d. for two or more resistors in series
apply the series-resistance formula with consistent units and identify the p.d. across a chosen resistor

[Maximum number: 1]

The diagrams show two different circuits.

Figure for Question 10.2.4—The formula for the combined resistance of two or more resistors in series question 1 — CAIE A-Level Physics AS

The cells in each circuit have the same electromotive force (e.m.f.) and negligible internal resistance. The three resistors each have the same resistance R.

In the circuit on the left, the power dissipated in the resistor is P.
What is the total power dissipated in the circuit on the right?

$\frac{P}{4}$

$\frac{P}{2}$

2 P

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10.2.4—The formula for the combined resistance of two or more resistors in series question 1