Electric cars offer consumers a good alternative over gasoline-powered cars. Direct current (DC)
powered cars are less expensive and can be overdriven for short periods of time. A 100 V, 20,000
W motor can be operated at 80,000 W for a short period of time and deliver four times its rated
power. While this may be great for short bursts of acceleration, too much overdriving causes the
motor to heat up to the point where it can literally burn itself out. Calculate the currents involved in
operating at both power “modes.”

Question

Electric cars offer consumers a good alternative over gasoline-powered cars. Direct current (DC) 
powered cars are less expensive and can be overdriven for short periods of time. A 100 V, 20,000 
W motor can be operated at 80,000 W for a short period of time and deliver four times its rated 
power. While this may be great for short bursts of acceleration, too much overdriving causes the 
motor to heat up to the point where it can literally burn itself out. Calculate the currents involved in 
operating at both power “modes.”

experimentx · Answer

use the realtion, P = V x I   where P is power, I is current and V is voltage