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JAMB Physics 1980 Question 39

Question 39

Electromagnetic Induction

High Tension (H.T.) transmission means

  1. A.to transmit a given amount of power, the tension in the conducting wire must be high
  2. B.heat is not lost when current is passed through a conductor
  3. C.heat is gained when a given power is transmitted
  4. D.a big transformer is required to transmit power
  5. E.transmission of power at low current and high voltage.
Show the answer and explanation

Answer: E (transmission of power at low current and high voltage.)

Explanation

H.T. transmission sends power at a very high voltage so that the current is small, which reduces I²R heat losses in the cables.