An electric car is being designed to have an average power output of 4,600 W for 2 h before needing to be recharged. (Assume there is no wasted energy.)

How much energy would be stored in the charged batteries? = J

The batteries operate on 80 V. What would the current be when they are operating at 4,600 W? = A

To be able to recharge the batteries in 1 h, how much power would have to be supplied to them? = W

Question

Sonny Bates

Physics

1 June, 22:39

An electric car is being designed to have an average power output of 4,600 W for 2 h before needing to be recharged. (Assume there is no wasted energy.)

How much energy would be stored in the charged batteries? = J

The batteries operate on 80 V. What would the current be when they are operating at 4,600 W? = A

To be able to recharge the batteries in 1 h, how much power would have to be supplied to them? = W

+3

Answers (1)

Know the Answer?

Valerie · Answer 1

a) 3312 x 10⁴ J

b) I = 57.5 A

c) 9200 W

Explanation:

Given that

P = 4600 W

Time t = 2 h = 2 x 3600 s = 7200 s

We know that

1 W = 1 J/s

a)

Energy stored in the battery = P. t

=4600 x 7200 J

=3312 x 10⁴ J

b)

We know that power P given as

P = V. I

V=Voltage, I = Current

4600 = 80 x I

I = 57.5 A

c)

The energy supplied = 4600 x 2 = 9200 W