Question

A low-loss transformer has $230V$ applied to the primary and gives $4.6V$ in the secondary. The secondary is connected to a load, which draws $50A$ of current. The current (in ampere) in the primary is

• A. $0.1$
• B. $1.0$
• C. $10$
• D. $250$

Answer 1

The correct option is B $1.0$

Power in primary and secondary transformers should be same

$\Rightarrow V_1{I}_1=V_2{I}_2$

$\Rightarrow 230\times I=4.6\times 50$

$\Rightarrow I=1A$

Therefore option $B$ is correct