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 220V and 50% of power is lost, then the current in secondary will be:

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

Answer 1

The correct option is A

2.5A

In a transformer
$\eta =\frac{P_0}{P_i}\frac{50}{100}=\frac{V_s{I}_s}{V_p{I}_p}\frac{1}{2}=\frac{220\times I_s}{220}\times \frac{1}{5}{I}_s=2.5A$