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MHT CET20226 Aug 2022Evening ShiftPhysicsAlternating CurrentActual

A step-down transformer has N_ S to N_ p ratio of 20: 1 . If 8 ~V are developed across 0.4 secondary, the primary current will be

Options

  1. A1 ~A
  2. B0.5 ~A
  3. C4 ~A
  4. D2 ~A

Correct answer

A. 1 ~A

Step-by-step solution

For a step-down transformer: N_ P N_ S = 20 1 = V_p V_ s = I_s I_p aligned & I_s= 8 ~V 0.4 ~A =20 ~A & I_p=I_s 1 20 =1 ~A aligned

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