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MHT CET202122 Sep 2021Evening ShiftPhysicsAlternating CurrentActual

A step-down transformer has turns ratio 20: 1 . If 8 ~V is applied across 0.4 ohm secondary coil, then the primary current will

Options

  1. A2 A
  2. B1 A
  3. C0.5 A
  4. D4 A

Correct answer

B. 1 A

Step-by-step solution

aligned & V _ s =8 ~V , R _ s =0.4 & I _ s = V _ s R _ s = 8 0.4 =20 ~A & I _ p I _ s = N _ s N _ p = 1 20 & I _ p = I _ s 20 = 20 20 =1 ~A aligned

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