A student builds a circuit with a battery, an ammeter, a heater and a light-dependent resistor (LDR) connected one after another in series. The battery is assumed to have negligible internal resistance. A voltmeter is placed across the heater, in parallel with it.
(a)[3]
In Fig. 5.1, finish the circuit diagram for this setup.
(b(i))[2]
Calculate the resistance of the heater.
(b(ii))[1]
Calculate the ammeter reading.
(c(i))[2]
State and explain whether the new wire has a resistance that is greater than, less than or the same as that of the wire in (b).
(c(ii))[2]
State and explain whether the new voltmeter reading is greater than, less than or equal to $4.8\,\text{V}$.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct heater or LDR symbol” …