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  4. 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?

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Q. 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?

NEETNEET 2021Alternating Current

Solution:

$V_{p}=220\, V$
$ V_{s}=11 \,V $
$P=44 \,W$
As it is an ideal transformer
$V_{P} i_{P}=V_{S} i_{S}=44 W$
$220 \times i_{P}=44$
$i_{P}=\frac{44}{220}=\frac{1}{5}=0.2 A$