A $60\,\text{W}$ filament lamp is supplied from the $240\,\text{V}$ mains electricity supply.
(a(i))[2]
Calculate the current flowing through the lamp.
(a(ii))[2]
Calculate the lamp's resistance.
(b(i))[1]
State the voltmeter reading in Fig. 6.1.
(b(ii))[2]
State and explain how the lamp’s resistance now compares with the value calculated in (a)(ii).
(b(iii))[1]
When a filament lamp blows, it often happens right after switch-on. Suggest why this occurs.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “I = P / V, or 60 / 240” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI