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NEET2016PhysicsAlternating CurrentActual

The potential differences across the resistance, capacitance, and inductance are 80   V ,   40   V and 100   V , respectively in an LCR circuit. The power factor of this circuit is

Options

  1. A0 . 4
  2. B0 . 5
  3. C0 . 8
  4. D1 . 0

Correct answer

C. 0 . 8

Step-by-step solution

P ac = V rms I rms cos ϕ , where, cos ϕ is the power factor. cosϕ = R z = V R V = 80 80 2 + 100 - 40 2 = 80 100 = 0.8 . where, Z is the impedance of the circuit.

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