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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?

  

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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

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Correct answer: (1) 0.2 A

Explanation:

220 × ip = 44

⇒ ip = \(\frac{44}{220}\) = \(\frac{1}{5}\)

= 0.2A

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