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  • A step – down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80%, the current drawn from the line is:<div cla

A step – down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80%, the current drawn from the line is:

Option: 1

3 A


Option: 2

30 A


Option: 3

0.3 A


Option: 4

2.4 A


Answers (1)

best_answer

Here,\mathrm{E}_{\mathrm{p}}=1000 \mathrm{~V}, \mathrm{I}_{\mathrm{s}}=20 \mathrm{~A}, \mathrm{E}_{\mathrm{s}}=120 \mathrm{~V}
\eta=80 \%
As \eta=\frac{E_s I_s}{E_p I_p} \quad \therefore \frac{80}{100}=\frac{120 \times 20}{1000 \times I_p}

\mathrm{I}_{\mathrm{p}}=\frac{2.4 \times 10}{8}=3 \mathrm{~A}

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chirag

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