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(a) Ifthe electric motor draws 8.00 kW, what isthe current delivered to themotor

ID: 1669066 • Letter: #

Question


(a) Ifthe electric motor draws 8.00 kW, what isthe current delivered to themotor? (b) Ifthe electric motor draws 8.00 kW as thecar moves at a steady speed of 20.0 m/s, how far will the cartravel before it is "out ofjuice"?

Explanation / Answer

(a) We know that P = V i            8.0 *1000 = 12 * i                  =>     i = 8000/12       = 666.66 A (b) The energy consumed by motor in 1 second = 8000 J      Thus the time for which the total energylast                       t = (2.20 x 107) / 8000                         = 2750 sec       The distance traveled by car in tsec is               s = v * t                          = 20 * 2750    = 55000 m                          = 55.0 km

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