Internal resistance quiz, Physics grades 11-12 (free)

Quick answer: The emf of a source is the energy it gives each coulomb of charge. This Physics 11-12 quiz checks internal resistance with 10 multiple-choice questions and instant feedback; every answer comes with a short explanation.

Internal resistance quiz for A Level physics: 10 questions with answers

This internal resistance quiz for physics grades 11-12 has quick multiple-choice questions with instant feedback. Need a refresher first? Read the lesson or do the worksheet on internal resistance.

Ten multiple-choice questions on emf, terminal voltage, Kirchhoff’s laws and potential dividers. Choose one answer, then read the explanation, which names the mistake behind each wrong option.

Level: Physics grades 11-12 (A Level · IB · Class 11-12) · Curriculum: IB B.5

Contents

Internal resistance quiz: the questions

What does the emf of a cell represent?

A cell has ε = 1.5 V and r = 1.0 Ω and supplies 0.50 A. What is the terminal p.d.?

What does Kirchhoff’s first law state?

Kirchhoff’s second law is a statement of conservation of what?

On a graph of terminal p.d. against current, what does the gradient give?

Two resistors of 2.0 kΩ and 6.0 kΩ are in series across 8.0 V. What is the voltage across the 6.0 kΩ resistor?

Which load resistance gives maximum power from a source of internal resistance r?

Why does a voltmeter of finite resistance lower the output of a potential divider?

Two identical cells are connected in parallel. What is the emf of the combination?

What is the short-circuit current of a cell with ε = 1.5 V and r = 0.30 Ω?

Definition of emf? — Energy transferred per coulomb by the source

Terminal p.d. formula? — V = ε − Ir

Current in a circuit with internal resistance? — I = ε / (R + r)

Kirchhoff’s first law? — Current in = current out at a junction

Kirchhoff’s second law? — Σε = ΣIR around a loop

Potential divider output? — V_out = V_in × R₂ / (R₁ + R₂)

Short-circuit current? — I = ε / r

Gradient of V against I graph? — −r, the internal resistance

Condition for maximum power transfer? — R = r

Lost volts equal what? — Ir, the p.d. across internal resistance

Internal resistance quiz for A Level physics: 10 questions with answers

Internal resistance quiz: the questions