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KCET2007PhysicsAlternating Current

A step-down transformer reduces the voltage of a transmission line from 2200 ~V to 220 ~V . The power delivered by it is 880 ~W and its efficiency is 88 % . The input current is

Options

  1. A4.65 ~mA
  2. B0.045 ~A
  3. C0.45 ~A
  4. D4.65 ~A

Correct answer

C. 0.45 ~A

Step-by-step solution

Efficiency of transformer, aligned &= Output po Input powe 88 100 &= 880 P_ i P_ i &=1000 ~W Input current, I_ P &= P_ i V_ i &= 1000 2200 &=0.45 ~A aligned

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