Inside a box there is an unknown electrical component. It is joined to two external terminals P and Q on the outside of the box. As shown in the circuit diagram of Fig. 4.1, a battery, an ammeter, a switch, a lamp and two crocodile clips are connected. The unknown component is either a broken wire or a connecting wire or a diode.
(a(i))[1]
Describe how to use the apparatus to determine whether the component in the box is a broken wire.
(a(ii))[1]
Describe how to use the apparatus to determine whether the component in the box is a connecting wire.
(a(iii))[1]
Describe how to use the apparatus to determine whether the component in the box is a diode.
(b)[1]
The component in the box is a low resistance connecting wire. A second box appears the same, but it contains a resistor with a higher resistance. Describe how to use the apparatus to determine which box contains the resistor.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “No current / lamp does not light whichever way around the circuit is connected” …