Physics 5054 · O Level · Circuit diagrams and circuit components

Circuit diagrams and circuit components — practice question

A student measures how long a $1.5\,\text{V}$ cell can supply a constant current of $0.3\,\text{A}$.
(a(i))[2]

In the space below, draw the circuit she uses.

(a(ii))[1]

Name the equipment the student uses to 1. measure the current, 2. change the resistance, 3. measure the time.

(a(iii))[1]

The student selects one of three analogue meters to measure the current. Their ranges are $0$ to $10\,\text{A}$, $0$ to $1\,\text{A}$ and $0$ to $0.1\,\text{A}$. Explain why the $0$ to $1\,\text{A}$ meter is the best choice.

(a(iv))[1]

Describe the adjustment the student makes to the circuit so that the current stays constant.

(b)[1]

A second student repeats the experiment with a much larger current. Suggest one hazard that this could cause.

Worked solution & mark scheme

This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: Accurate circuit symbols for the cell, ammeter and variable resistor

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