Question

The efficiency of a transformer is $98$%. The primary voltage and current are $200V$ and $6A$. If the secondary voltage is $100V$, the secondary current is :

• A. $11.76A$
• B. $12.25A$
• C. $3.06A$
• D. $2.94A$

Answer 1

The correct option is A $11.76A$

Primary power of transformer $=200\times 6$

Secondary Power is $100\times i$

Then we have,

$\frac{98}{100}\times 200\times 6=100\times i$

$\therefore i=11.76A$