Question

In an ideal transformer, the voltage and the current in primary coil are $200\text{V}$ and $2\text{A}$ respectively. If the voltage in the secondary coil is $200\text{V}$, then the value of current in the secondary coil will be

• A. $0.2\text{A}$
• B. $2\text{A}$
• C. $10\text{A}$
• D. $20\text{A}$

Answer 1

The correct option is A $0.2\text{A}$

As the transformer is ideal the power in both coils is conserved
$P_p=P_s$
$V_p{I}_p=V_s{I}_s$
$200\times 2=2000\times I_s$
$I_s=0.2A$