First slide

Electrical machines and devices

Question

In a step up transformer, if ratio of turns of primary to secondary is 1 : 10 and primary voltage is 230 V. If the load current is 2A, then the current in primary is

Moderate

A

20 A
B

10 A
C

2 A
D

1 A

Solution

$\frac{N_{P}}{N_{S}} = \frac{I_{S}}{I_{P}} \Rightarrow I_{P} = \frac{N_{S}}{N_{P}} I_{S} = \frac{10}{1} \times 2 = 20 A$

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