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NEET2008PhysicsAlternating CurrentActual

In an A C circuit the emf (e) and the current (i) at any instant are given respectively by e=E₀ ti=I₀ ( t- ) The average power in the circuit over one cycle of AC is

Options

  1. AE₀ I₀ 2
  2. BE₀ I₀ 2
  3. CE₀ I₀ 2
  4. DE₀ I₀

Correct answer

C. E₀ I₀ 2

Step-by-step solution

Key Idea: The power is defined as the rate at which work is being done in the circuit. Power = rate of work done in one complete cycle. aligned & P_ a = W T & P_ a = (E₀ I₀ ) T / 2 T & P_ a = E₀ I₀ 2 aligned where is called the power factor of an AC circuit.

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