Question

A motor delivers maximum power when connected to a source of 220v. Then its back emf is​

Answer 1

The back emf of the motor is 110 V

Explanation:

Given:

A motor delivers maximum power when connected to a source of 220 V

To find out:

Its back emf

Solution:

We know that

The mechanical power is developed by a DC motor is maximum when back emf is equal to half of applied voltage

i.e. $E_b=\frac{V_t}{2}$

Here,

$V_t=220$ V

Thus,

Back emf

$E_b=\frac{220}{2}$ V

or, $E_b=110$ V

Hope this answer is helpful.

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