Question

How much current is drawn by primary of a transformer connected to 220 V supply, when it power to a 110 V and

550 W refrigerator

• A. 2.5 A
• B. 0.4 A
• C. 4 A
• D. 25 A

Answer 1

Answer: (A)

2.5 A

Answer 2

$V_{p} = 220V,V_{s} = 110V,V_{s}I_{s} = 550W,$ Now $V_{p}I_{p} = V_{s}I_{s}$ or $I_{p} = \frac{V_{s}I_{s}}{V_{p}} = \frac{550}{220} = 2.5A$