A 60 W load is connected to the secondary of a transformer

Question:

A 60 W load is connected to the secondary of a transformer whose primary draws line voltage. If a current of 0.54 A flows in the load, what is the current in the primary coil? Comment on the type of transformer being used.

Solution:

Ps = 60 W

Is = 0.54 A

Primary voltage = 220 V

Vs = 60/0.54 = 110 V

The transformer is a step-down transformer as the voltage in the secondary is less than the voltage in the primary.

The transformation ratio is r = Vs/Vp = Ip/Is

Substituting the values we get,

Ip = 0.27 A

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