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Chapter 32: Q. 37 (page 925)

The motor of an electric drill draws a 3.5Arms current at the power-line voltage of 120Vrms. What is the motor's power if the current lags the voltage by20掳.

Short Answer

Expert verified

The motor's power is394.98W.

Step by step solution

01

Given Information

We have given that Irms=3.5Aand Vrms=120Vand the phase angle 蠒=20掳.

We have to find the power of motor.

02

Formula Used

Now, using the formula

P=Irms.Vrms.cos蠒let this be equation 1

where P is the power of motor and Irmsis rms current and Vrmsis rms voltage and 蠒is the phase angle.

03

Simplify

Now, by putting all the values in equation 1,

We get,

P=3.5脳120脳cos20掳

On solving,

We get P=394.98W

Hence, the power of motor is394.98W

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