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3.2 Simple circuits

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Question 2
F

Two resistors, R1 and R2, are connected in series with a 9.0 V battery.

The resistance of R1 is 20 Ω. The resistance of R2 is 10 Ω.

a.

Calculate the total resistance of the circuit.

[1]
b.

Use the equation: potential difference=current×resistance\text{potential difference} = \text{current} \times \text{resistance}potential difference=current×resistance

Calculate the current in the circuit.

[2]
c.

Calculate the potential difference across R1.

[2]
d.

A student says:

'The potential difference across R2 must also be 6.0 V, because the current in R2 is the same as the current in R1.'

Explain why the student is wrong. Give the potential difference across R2.

[2]
Markscheme

3.2 Simple circuits Questions

  1. GCSE
  2. /Physics
  3. /3.2 Simple circuits

42 exam-style questions on OCR GCSE Physics 3.2 Simple circuits, covering 3.2.1 Series and parallel circuits, 3.2.2 Circuit symbols and circuit diagrams, 3.2.3 Current, potential difference and resistance, 3.2.4 Ohm's law, 3.2.5 Ohmic and non-ohmic resistors, 3.2.6 Designing circuits to investigate resistance, 3.2.7 Linear and non-linear circuit components, 3.2.8 Current-potential difference graphs for components, 3.2.9 Resistance in series and parallel, 3.2.10 Series and parallel circuit problems, 3.2.11 Circuits for measurement and testing, 3.2.12 Power transfer in circuit devices, and 3.2.13 Energy and power in resistor circuits. Each one has a worked solution and a mark scheme showing where the marks go.

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