(a)[2]
State how the resistance of the lamp filament changes when the p.d. goes (i) from 0 V to 1.0 V, and (ii) from 1.0 V to 8.0 V.
(b)[5]
Calculate, for normal brightness, (i) the resistance of the lamp, (ii) the power of the lamp.
(c)[2]
Determine (i) the electromotive force (e.m.f.) of the power supply, (ii) the current from the power supply.