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COMEDK2016PhysicsAlternating Current

Transformer works on 220 ~V and its efficiency is 80 % . If output power is 8 ~kW , primary current is approximately

Options

  1. A35 ~A
  2. B18 ~A
  3. C22 ~A
  4. D45 ~A

Correct answer

D. 45 ~A

Step-by-step solution

Given, V_ p =220 ~V , =80 %=0.8P₀=8 ~kW =8000 ~W Efficiency of transformer, = Output power Input power = P_ o P_ i 0.8= 8000 p_ i P_ i = 8000 0.8 =10000 V_ p I_ p =10000 or I_ p = 10000 220 =45.5 ~A =45 ~A

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