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An ideal step-up transformer is used in a power transmission station. It is connected to a 200 V AC mains supply and draws a primary current of 10 A . If the voltage across the secondary coil is stepped up to 4000 V , what is the current flowing in the secondary circuit?

Options

  1. A0.5 A
  2. B5.0 A
  3. C20 A
  4. D200 A

Correct answer

A. 0.5 A

Step-by-step solution

For an ideal transformer, the input power is equal to the output power. V_p I_p = V_s I_s Substituting the given values: 200 10 = 4000 I_s 2000 = 4000 I_s I_s = 2000 4000 = 0.5 A Answer: 0.5 A

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