When the Turns Ratio of Transformer is 20

By Aina Parasher|Updated : July 13th, 2022

When the turns ratio of a step-up-transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is-

  1. 12 V
  2. 120 V
  3. 240 V
  4. 2400 V

Answer: C. 240 V

When the turns ratio of a step-up-transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is 240 V.

Solution

In a step-up transformer primary winding (or the winding for which AC voltage source is connected) voltage will be smaller than secondary winding. For this to be accomplished, the number of turns on secondary winding (NS) should be greater than primary winding turns (NP).

Given, 

Turns ratio (or) voltage ratio of transformer a=NS/NP=VS/VP=20

Primary voltage VP=12 V

Then, secondary voltage VS=a×VP

VS=20×12 V

VS=240 V

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