QuestionJuly 31, 2025

What should the transformer rating be when replacing a 24V transformer with a current requirement of 2.5A? 40VA 50VA 54VA 75VA

What should the transformer rating be when replacing a 24V transformer with a current requirement of 2.5A? 40VA 50VA 54VA 75VA
What should the transformer rating be when replacing a 24V transformer with a current requirement of 2.5A?
40VA
50VA
54VA
75VA

Solution
3.6(292 votes)

Answer

75VA Explanation 1. Calculate the required VA rating Use the formula for apparent power: **VA = V \times I**. Here, V = 24V and I = 2.5A. So, VA = 24 \times 2.5 = 60VA. 2. Choose the nearest higher standard rating The calculated VA is 60VA. The nearest higher standard rating from the options provided is 75VA.

Explanation

1. Calculate the required VA rating<br /> Use the formula for apparent power: **$VA = V \times I$**. Here, $V = 24V$ and $I = 2.5A$. So, $VA = 24 \times 2.5 = 60VA$.<br /><br />2. Choose the nearest higher standard rating<br /> The calculated VA is 60VA. The nearest higher standard rating from the options provided is 75VA.
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