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? [2023]

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Solution

Q.
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 [2023]

1 3.7 A

2 0.37 A

3 0.27 A

4 2.7 A

Ans.
(3)

Let current in the primary is $I_{p} .$

As, the transformer is ideal

$∴$ $P_{i} = P_{0}$

$\Rightarrow 220 \times I_{p} = 60$

$\Rightarrow I_{p} = \frac{60}{220} = \frac{6}{22} = \frac{3}{11} = 0.27$ $A$

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