An electric car is designed to run on a bank of batteries with a total potential difference of 47 V and a total energy storage of 4.5×107 J.?
If the electric motor draws 6.4 kW, what is
the current delivered to the motor?
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Power = voltage * current
current = power / voltage = (6400 W / 47 V) = 136.17 A
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Extra credit?
6.4 kW = 6400 W = 6400 J/s
So that stored 4.5 x 10^7 J will run the car for (4.5 x 10^7 J / 6400 J/s) = 7031 s
{Just under 2 hours if the thing is 100% efficient}
power = E * I
6400 watts = 47 volts x I
I = 136.17 amps