GCSE Standard Questions: Electric Circuits

Q11. Anyanka builds a circuit to investigate the resistance of component X.

(a)

(i) What is the name of this component?

[1 mark]

(ii) Why is this component needed in this circuit?

[1 mark]

(b) Anyanka uses the circuit to take a series of current and potential difference readings.

She then plots a graph of her results.

Here is a sketch of her graph:

(i) Look at the sketch graph shape and use it to identify the type of component X is.

[1 mark]

(ii) The resistance of component X varies as the potential difference changes. Describe how the graph shows this and explain why this happens.

[3 marks]

(i) Calculate the potential difference across component X.

[3 marks]

(ii) Calculate the power of component X when a current of 0.25A flows.

[3 marks]

(Total 12 marks)