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Physics-

General

Easy

Question

An electric motor operates on a $50 blank v o l t$ supply and a current of $12 A$ . If the efficiency of the motor is 30%, what is the resistance of the winding of the motor

$6 Ω$
$4 Ω$
$2.9 Ω$
$3.1 Ω$

The correct answer is: $2.9 capital omega$

$eta equals fraction numerator e over denominator E end fraction cross times 100 rightwards double arrow e equals 0.3 blank E$
Now, $i equals fraction numerator E minus e over denominator R end fraction rightwards double arrow 12 equals fraction numerator 50 minus left parenthesis 0.3 cross times 50 right parenthesis over denominator R end fraction rightwards double arrow R equals 2.9 capital omega$

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