The voltage and current in the primary of a transformer are 200V and 2A respectively....
PHYSICS
WAEC 1999
The voltage and current in the primary of a transformer are 200V and 2A respectively. lf the transformer is used to light ten 12 V, 30 W bulbs, calculate its efficiency.
- A. 100%
- B. 90%
- C. 75%
- D. 50%
Correct Answer: C. 75%
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