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15/09/2021 11:11 am
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A step-down transformer connected to an ac mains supply of 220 V is made to operate at 11V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
(1) 0.2 A
(2) 0.4 A
(3) 2A
(4) 4A
1 Answer
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15/09/2021 11:15 am
Correct answer: (1) 0.2 A
Explanation:
220 × ip = 44
⇒ ip = \(\frac{44}{220}\) = \(\frac{1}{5}\)
= 0.2A