An electrical motor has a degree of efficiency ( Eff ) equal to the ratio of its useful output power ( $P _ { 0 }$ ) to the input power ( $p _ { 1 }$ ) required to operate it.
A) $E f f = \frac { P _ { 0 } } { P _ { 1 } }$
B) $E f f = \frac { P _ { 1 } } { P _ { 2 } }$
C) $E f f = \frac { P ^ { 2 } 0 } { P _ { 1 } }$
D) $E f f = \frac { P _ { 1 } } { P _ { 0 } }$

Question

Quizplus · Accepted Answer

The efficiency of an electrical motor is defined as the ratio of its useful output power to the input power required to operate it. Therefore, option A is the correct formula for efficiency. Option B is incorrect because it does not take into account the useful output power. Option C is also incorrect because raising the output power to the power of 2 would not lead to an accurate measure of efficiency. Option D is incorrect because it has the useful output power in the denominator, which is not the correct placement for this term in the efficiency formula.

An Electrical Motor Has a Degree of Efficiency ( Eff P0P _ { 0 }P0​

An Electrical Motor Has a Degree of Efficiency ( Eff $P _ { 0 }$