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NEET2015PhysicsAlternating CurrentActual

A resistance R draws power P when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes Z , the power drawn will be:

Options

  1. AP R Z 2
  2. BP R Z
  3. CP R Z
  4. DP

Correct answer

A. P R Z 2

Step-by-step solution

We know P = V 2 R     ;       P ′ = V . V z cos ⁡ Φ       V 2 = P R     &   cos ⁡ Φ = R z       P ′ = V 2 z   R z       ⇒       P R z 2   R = P R 2 z 2 = P R z 2

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