What is the equation for: An electric car is being designed to have an average p

Question

What is the equation for:
An electric car is being designed to have an average power output of 6,800 W for 2 hours.
(a). How much energy would be stored in the charged batteries? In Joules
(b). The batteries operate on 20 V. What would the current be when they are opersting at 6,800 W ?
(c). To be able to recharge the batteries in 1 h, how much power would have to be supplied to them ? What is the equation for:
An electric car is being designed to have an average power output of 6,800 W for 2 hours.
(a). How much energy would be stored in the charged batteries? In Joules
(b). The batteries operate on 20 V. What would the current be when they are opersting at 6,800 W ?
(c). To be able to recharge the batteries in 1 h, how much power would have to be supplied to them ?
An electric car is being designed to have an average power output of 6,800 W for 2 hours.
(a). How much energy would be stored in the charged batteries? In Joules
(b). The batteries operate on 20 V. What would the current be when they are opersting at 6,800 W ?
(c). To be able to recharge the batteries in 1 h, how much power would have to be supplied to them ?

Explanation / Answer

a) energy = power*time = 6800*2*3600 = 48960000 J OR 48.96*10^6 J

b) VI = P

=> I = 6800/(20) = 340 amp

c) power = 2*6800 = 13600 W

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