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Transformer

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2023 1 question

A $12\ V$, $60\ W$ lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of $220\ V$. Assuming the transformer to be ideal, what is the current in the primary winding?

2021 1 question

A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?