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A transformer is based on the principle of mutual induction. Input is supplied to primary coil and output is taken across the secondary coil of transformers. It is found that \( E_{s} / E_{p}=i_{p} / i_{s} \) when there is no energy loss, the efficiency of a transformer is given by
\[
\eta=\frac{P_{\text {output }}}{P_{\text {input }}}=\frac{E_{s} i_{s}}{E_{p} i_{p}}
\]
- How much current is drawn by the primary coil of a transformer which steps down \( 220 \mathrm{~V} \) to \( 44 \mathrm{~V} \) to operate a device with an impedance of \( 880 \Omega \) ?
(a) \( 1 \mathrm{~A} \)
(b) \( 0.1 \mathrm{~A} \)
(c) \( 0.01 \mathrm{~A} \)
(d) \( 0.02 \mathrm{~A} \)
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