A student builds an electrical circuit and sketches part of the circuit diagram, as shown in Fig. 8.1. The diagram includes a power supply, lamp A, lamp B and connecting wires.
(a(i))[1]
On Fig. 8.1, draw the circuit symbols for three devices so that the student can measure the total current in the circuit.
(a(ii))[1]
On Fig. 8.1, draw the circuit symbols so that the student can vary the current in lamp B only.
(a(iii))[2]
On Fig. 8.1, draw the circuit symbols so that the student can measure the potential difference (p.d.) across lamp B.
(b)[3]
Calculate the resistance of lamp A from the readings given.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Ammeter connected in series with the power supply” …