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COMEDK2024Evening ShiftPhysicsAlternating CurrentActual

A transformer of 100 % efficiency has 200 turns in the primary and 40000 turns in the secondary. It is connected to a 220 ~V main supply and secondary feeds to a 100 ~K resistance. The potential difference per turn is

Options

  1. A18 V
  2. B11 V
  3. C1.1 V
  4. D25 V

Correct answer

C. 1.1 V

Step-by-step solution

The transformer equation relates the primary voltage V_p , secondary voltage V_s , number of primary turns N_p , and number of secondary turns N_s as V_p N_p = V_s N_s . The potential difference per turn is defined as the ratio of the voltage across a coil to the number of turns in that coil. For the primary coil, the potential difference per turn is V_p N_p = 220 V 200 turns = 1.1 V/turn . Since the transformer is ideal (100% efficiency), the potential difference per turn is the same for both the primary and secon

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