Question

An ideal transformer is used on 220 V line to deliver 2 A at 110 V. The current through the primary is :

• A. 10 A
• B. 5 A
• C. 1 A
• D. 0.1 A

Answer 1

Answer: (C)

1 A

$e_p=220$ , $e_s=110$ , $I_s=2A$

so $\frac{e_p}{e_s}=\frac{I_s}{I_p}$

$I_p=1A$