What is the ratio of power output to power input?

Solution

Given,

Transformer input power to primary winding P_in=120 W,

Power loss in primary winding of transformer P_L1=8.5 W,

So, available power in primary winding of transformer P₁= P_in-P_L1

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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