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NEET2017PhysicsAlternating CurrentActual

A transformer with efficiency 80 % works at 4 ~kW and 100 ~V . If the secondary voltage is 200 ~V , then the primary and secondary currents are respectively

Options

  1. A40 ~A and 16 ~A
  2. B16 ~A and 40 ~A
  3. C20 ~A and 40 ~A
  4. D40 ~A and 20 ~A

Correct answer

A. 40 ~A and 16 ~A

Step-by-step solution

aligned & (a) : Here, =80 % & P_i=4 ~kW =4000 ~W & V_p=100 ~V , V_s=200 ~V & I_p= P_i V_p = 4000 100 =40 ~A & = V_s I_s V_p I_p ; 80 100 = 200 I_s 4000 = I_s 20 & or I_s= 20 80 100 =16 ~A aligned

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