Question

In a step-up transformer ratio of number of turns in primary to seconday coil is $1: 25 .$ If input voltage is $230$ volt and load current is $2 \,amp$, then current in primary is :

• A. 50 A
• B. 25 A
• C. 12.5 A
• D. 6.25 A

Answer 1

Answer: (A)

For step up transformer
$ \frac{I_{p}}{I_{s}}=\frac{N_{s}}{N_{p}} $
$ \frac{I_{p}}{2}=\frac{25}{1} $
$\Rightarrow I_{p}=50\, amp$