In an electric motor, the winding resistance of which is 0.75 Ohm, the current strength is 20 A.

| August 9, 2021 | education

In an electric motor, the winding resistance of which is 0.75 Ohm, the current strength is 20 A. How much heat will be released in this motor in 1 minute?

Given:

I = 20 Amperes – the strength of the current passing through the winding of the electric motor;

R = 0.75 Ohm – resistance of the electric motor winding;

t = 1 minute = 60 seconds – time span.

It is required to determine Q (Joule) – the amount of heat that will be released in this engine over a period of time t.

Determine the voltage at the ends of the winding of the electric motor:

U = I * R = 20 * 0.75 = 15 Volts.

Then, the engine power will be equal to:

W = U * I = 15 * 20 = 300 watts.

The amount of heat will be equal to:

Q = W * t = 300 * 60 = 18000 Joules.

Answer: in 1 minute, this engine will release 18,000 Joules of heat.



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