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3.2 Simple circuits

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Question 28
H

A student measures the resistance of different lengths of the same wire.

The graph of resistance against length is a straight line, but it does not pass through the origin.

Which is the most likely reason for this?

[1]
A

The resistance of the leads and clips was included in every reading

B

The readings were not repeated, so there were random errors in them

C

The wire got hotter as the length of wire in the circuit was increased

D

The ammeter was connected in parallel with the wire instead of in series

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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