Transformers
Quiz by Oak National Academy: GCSE Physics AQA Higher
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6 questions
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- Q1When is a p.d. (potential difference) induced across the secondary coil of a transformer?when there is a changing magnetic field in the primary coilwhen the primary coil is connected to a direct currentwhen the secondary coil is connected to a batterywhen the transformer is switched off30s
- Q2Which of the following can a transformer increase?powerpotential differenceresistancecurrent30s
- Q3How does the number of turns on the coils affect the potential difference in a transformer?More turns always mean higher potential difference.Fewer turns always mean higher potential difference.The ratio of turns equals the ratio of potential difference.The number of turns does not affect the potential difference.30s
- Q4Calculate the output p.d. of a transformer if the primary p.d. is 240 V, the primary coil has 50 turns, and the secondary coil has 25 turns.Users enter free textType an Answer30s
- Q5If the power input to a transformer is 1000 W and the power output is 950 W, what is the efficiency of the transformer?Users enter free textType an Answer30s
- Q6What current is drawn from a 230 V power supply to a transformer if the output is 15.0 V and 1000 mA? Give your answer in mA to 3 s.f.Users enter free textType an Answer30s