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A step up transformer works on 220V and gives 2A to an external resistor. The turn ratio between the primary and secondary coils is 2 : 25. Assuming 100% efficiency, find the secondary voltage. Primary current and power delivered

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2750V, 25A, 5500W

1600V, 1A, 5000W

4000V, 1A, 5500W

5500V, 0.16A, 2750W

answer is A.

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Detailed Solution

$\Rightarrow$ $\frac{V_{s}}{V_{p}} = \frac{N_{s}}{N_{P}}$

$\Rightarrow \frac{V_{s}}{220} = \frac{25}{2}$

$\Rightarrow V_{s} = 2750 V$

$\Rightarrow i_{p} = \frac{N_{P}}{N_{S}} \times i_{s} = \frac{25}{2} \times 2 = 25 A$

$\Rightarrow P = V_{s} i_{s} = 2750 \times 2 = 5500 W$ .

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