  # What is the ratio of power output to power input?

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Updated on: September 25th, 2023 In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, then what is the ratio of power output to power input, neglecting any other issues ______.

## The ratio of power output to power input is 0.93.

Solution

Given,

Transformer input power to primary winding Pin=120 W,

Power loss in primary winding of transformer PL1=8.5 W,

So, available power in primary winding of transformer P1= PinPL1

P1=120-8.5

P1=111.5 W

In transformer power available on primary = power on secondary winding = 111.5 W

So, power available on secondary winding = output power of transformer = P2=111.5 W

Then, the ratio of power output to power input of transformer is =power output/power input

=111.5/120

=0.929

=0.93

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