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  • 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

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 ?

Option: 1

\mathrm{0.27\, A}


Option: 2

\mathrm{2.7\, A}


Option: 3

\mathrm{3.7\, A}


Option: 4

\mathrm{0.37\, A}


Answers (1)

best_answer

for ideal transformer,

\begin{aligned} & P_{\text {in }}=P_{\text {out }} \\ & \Rightarrow V_{\text {in }} I_{\text {in }}=V_{\text {out }} I_{\text {out }} \\ & \Rightarrow 220 \times I_{\text {in }}=60 \quad \Rightarrow I_{\text {in }}=0.27 \mathrm{~A} \end{aligned}

Posted by

Irshad Anwar

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