Transformers and the National Grid Quiz
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5 questions, one answer each
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1. A transformer has 500 turns on the primary coil and 100 turns on the secondary coil. What type is it?
- A. Step-up
- B. Step-down
- C. Rectifier
- D. Generator
2. An ideal transformer has 100 turns on the primary and 400 turns on the secondary. The input is 6.0 V. What is the output voltage?
- A. 1.5 V
- B. 6.0 V
- C. 24 V
- D. 400 V
3. Why does a transformer not work with a battery?
- A. Batteries have too low a voltage
- B. A steady current gives a constant magnetic field, so no voltage is induced
- C. The iron core melts
- D. The coils would be connected together
4. Cables carry a current of 50 A and have a resistance of 4.0 . What power is lost as heat?
- A. 200 W
- B. 800 W
- C. 10 000 W
- D. 12.5 W
5. Why does transmitting at a higher voltage reduce energy loss?
- A. The cables have lower resistance
- B. The current is smaller for the same power, so is smaller
- C. The power is increased
- D. Transformers store energy