A step-down transformer connected to a 240 V AC primary line has 600 primary turns and 50 secondary turns. If the secondary circuit draws a current of 6.0 A with 100% efficiency, what is the primary current?
Answer and explanation
Correct answer: B.
- Step 1: Transformer ratio formula: .
- Step 2: Substitute turn ratio: .
- Step 3: Solve for primary current: .
Answer
0.50 A.
Why not the others: '' multiplies turn ratio instead of dividing; '' uses incorrect turns ratio.
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