The electric supply from Kainji Dam is transmitted at high voltages of the order hundreds of kilovolts but is converted to domestic use of about 220 volts by

Jamb 1978

The electric supply from Kainji Dam is transmitted at high voltages of the order hundreds of kilovolts but is converted to domestic use of about 220 volts by A. commutators B. transistors C. valves and diodes D. rectifiers E. transformers 

ANSWER: Option E

EXPLANATION: A transformer is a passive device that helps to step up or step down voltage and current. 

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