A step down transformer connected to an AC mains supply of 220 V is made to operate at 
lamp. Ignoring power losses in the transformer, what is the current in the primary circuit? [NEET 2021]
Text Solution
Verified by ExpertsThe correct answer is:
A
Given, the main supply line voltage in transformer,
The rating of the lamp 
We know that, 
… (i)
Here, P is the power that operates the lamp,
V is the supply line voltage,
I P is the primary current in the transformer.
From Eq. (i), we get
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