Alternating Current Question 11
Question 11 - 2024 (30 Jan Shift 2)
A power transmission line feeds input power at $2.3 \mathrm{kV}$ to a step down transformer with its primary winding having 3000 turns. The output power is delivered at $230 \mathrm{~V}$ by the transformer. The current in the primary of the transformer is $5 \mathrm{~A}$ and its efficiency is $90 %$. The winding of transformer is made of copper. The output current of transformer is A.
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Answer: (45)
Solution:
$P_{i}=2300 \times 5$ watt
$P_{0}=2300 \times 5 \times 0.9=230 \times I_{2}$
$I_{2}=45 \mathrm{~A}$
