Question

A current of $5A$ is flowing at $220V$ in the primary coil of a transformer. If the voltage produced in the secondary coil is $2200V$ and $50\%$ of power is lost, then the current in the secondary will be

• A. 2.5 A
• B. 5 A
• C. 0.25 A
• D. 0.5 A

Answer 1

Answer: (C)

$V_p=220V,V_s=2200V,I_p=5A,I_s=?$
Power loss $=50\%$
Efficiency of transformer $(\eta )$ is defined as the ratio of output power and input power
ie, $\eta \%=\frac{P_{\text{out }}}{P_{\text{in }}}\times 100=\frac{V_s{I}_s}{V_p{I}_p}\times 100$
$50=\frac{2200\times I_s}{220\times 5}\times 100$
$I_s=0.25A$