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AQA · GCSE · Combined Science · Higher

Reversing current and potential-difference signs

Q01.3 1 mark

A student investigated how the current in a resistor varies with the potential difference across the resistor using a circuit with a cell.

Circuit diagram showing a cell, an open switch, a fixed resistor and a variable resistor connected in a single loop.

Figure 1

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Circuit diagram showing a cell, an open switch, a fixed resistor and a variable resistor connected in a single loop.
Figure 1

How should the student change the circuit to give negative values for current and potential difference?

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Marking points

  1. 1 State that the connections to the cell should be reversed.

Full-mark answer

Reverse the connections to the cell.

Why this answer loses marks

Swap the ammeter and voltmeter around.

Changing meter positions would not reverse the polarity of the supply.

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