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Transformer

A power trans...

Question

A power transformer is used to set up an alternating emf of $220 V$ to $4.4 k V$ to transmit $6.6 k W$ of power. The primary coil has $1000$ turns. What is current rating of secondary? (Assume efficiency 100%)

2.5 A

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1.5 A

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1.0 A

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0.75 A

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Solution

The correct option is A $1.5 A$
Power of transformer = $V_{1} I_{1} = V_{2} I_{2} V_{2} = 4.4 k V s e c o n d a r y v o l t a g e r a t i n g I_{2} = s e c o n d a r y c u r r e n t r a t i n g P = V_{2} I_{2} 6.6 k W = 4.4 k V I_{2} I_{2} = \frac{6.6}{4.4} = 1.5 A$

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