PHYSICS · Subjective · AP · Physics 2: Algebra-based · Electric Circuits · Electric Circuits
Problem
A fully charged 12V lead–acid battery is rated at 60Ah. It is used to power two identical headlamps, each of resistance 24Ω, connected in parallel.
(i) Calculate the current supplied by the battery when both lamps are switched on.
(ii) Assuming the battery can deliver 80% of its rated charge before requiring recharge, estimate the maximum duration for which the lamps can remain continuously lit.
(iii) Compute the total electrical energy delivered by the battery to the lamps during the time obtained in part (ii).