A 12 V car battery is found to be capable of storing 2 0 kW h of electrical energy - Physics - Work Energy And Power

Question

A 12 V car battery is found to be capable of storing 2 0 kW h of
electrical energy For a certain
electric car, it is necessary to develop 10 kW of power to
drive at 20 km/h
(a) Suppose that the car has 10 such batteries How long (in
hours) could it run if all 10 of them
released all of their energy?
(b) How far (in kilometres) can the car go on its 10 batteries
if they are fully
harged?

Vijay Yadav · Accepted Answer

(a) total energy stored in car = 10*2KWH = 20KWH
Car takes 2 KW for 20km/h
So, t = 20KWH/ 2KW = 10 Hours
(b) Total distance covered = v *t = 20*10 = 200 km