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
jamb 1978physics

The correct answer is E. transformers

The electric supply from Kainji Dam is transmitted at high voltages of the order of hundreds of kilovolts to reduce energy losses during transmission.

However, for domestic use, the voltage needs to be reduced to a safer and more usable level, typically around 220 volts.

The device responsible for converting high voltage to low voltage for domestic use is a transformer. 

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