Fig. 7.1 presents three identical lamps together with an ammeter connected to a power supply. The switches are closed. Each lamp is rated at $60\,\text{W}$ and works at its normal operating voltage of $110\,\text{V}$.
(a(i))[2]
Calculate the current through each lamp.
(a(ii))[1]
Calculate the current in the ammeter.
(a(iii))[1]
Calculate the voltage provided by the power supply.
(b(i))[2]
Calculate the resistance of the filament of one of the lamps when working normally.
(b(ii))[2]
In Table 7.1, tick any box in the right-hand column that indicates a possible difference between the filament of lamp X and a filament from one lamp in the circuit.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Any valid rearrangement of $P = IV$ OR $I = P / V$” …