International A LevelPhysicsEdexcelTopic Questions2. Waves & ElectricityE.M.F & Modelling Resistance

E.M.F & Modelling Resistance (Edexcel International A Level Physics)

Topic Questions

5 marks

A cell of e.m.f. ε is connected in series with a variable resistor with resistance R as shown. The internal resistance of the cell is r.

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When R is 12 Ω, the reading on the ammeter is 107 mA. The circuit is switched on for 300 seconds. In this time, 50 J of energy is transferred by the cell.

Calculate r.

r = .......................................................

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2 marks

Increasing R would make the terminal potential difference value closer to ε.
Explain why, without further calculation.

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4 marks

A voltmeter is added to the circuit as shown.

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Explain how this circuit can be used to determine a value for r using a graphical method.

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4 marks

A student connected the circuit shown. The battery has negligible internal resistance.

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The graph shows how the resistance of the thermistor varies with temperature.

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The reading on the voltmeter is 3.42 V.

Determine the temperature of the thermistor.

Temperature = ..........................

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4 marks

The student suggests that if the e.m.f. of the battery is doubled, the reading on the voltmeter will double.

Assess whether the student’s suggestion is correct.

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