First slide

Electrical machines and devices

Question

A step-up transformer has transformation ratio of 3 : 2. What is the voltage in secondary if voltage in primary is 30 V

Moderate

A

45 V
B

15 V
C

90 V
D

300 V

Solution

$\frac{V_{s}}{V_{p}} = \frac{N_{s}}{N_{p}} = k \Rightarrow \frac{V_{s}}{30} = \frac{3}{2} \Rightarrow V_{s} = 45 V$

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