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

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

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