Simple circuits

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Question 16
Medium

A student builds a circuit to investigate the resistance of component X.

Circuit diagram showing a series circuit consisting of a d.c. power source, an ammeter, a component X connected in parallel with a voltmeter, and a variable resistor.

a.

What is the name of this circuit component?

Circuit symbol of a rectangular box with a diagonal arrow pointing through it from bottom-left to top-right.

[1]
b.

Why is this component needed in this circuit?

[1]
c.

The student uses the circuit to take current and potential difference readings. The student plots a graph of the results.

A graph of current against potential difference. The y-axis is labeled Current and the x-axis is labeled Potential difference.

Look at the graph. What is component X in the circuit?

[1]
d.

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

[3]
e.

Component X has a resistance of 24 Ω24\ \Omega24 Ω when a current of 0.5 A0.5\text{ A}0.5 A flows.

Calculate the potential difference across component X. Use the equation: Potential difference=Current×Resistance\text{Potential difference} = \text{Current} \times \text{Resistance}Potential difference=Current×Resistance

[2]
f.

Component X has a resistance of 24 Ω24\ \Omega24 Ω when a current of 0.5 A0.5\text{ A}0.5 A flows.

Calculate the power of component X when a current of 0.5 A0.5\text{ A}0.5 A flows.

[2]

Simple circuits Questions

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