ELECTROMAGNETISM
1. Explain why transformer are used to reduce the current passing through the transmission cables of the National Grid
2. Explain why transformer does not work using a d.c. supply. Why is an a.c. supply necessary to make a transformer work?
3. Explain why a bicycle lamp attached to the to the dynamo does not light when the bicycle is stationary?
4. A student is trying to test a transformer using battery. Explain why the voltmeter connected to the secondary coil reads 0 V?
5. A wire is made to move through a magnetic field so that a potential difference is induced across its ends. State two ways in which the... CONTINUE READING
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