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What is the formula for calculating power in an AC circuit with a phase angle?

Practice Questions

Q1
What is the formula for calculating power in an AC circuit with a phase angle?
  1. P = V * I
  2. P = V * I * cos(θ)
  3. P = I^2 * R
  4. P = V^2 / R

Questions & Step-by-Step Solutions

What is the formula for calculating power in an AC circuit with a phase angle?
  • Step 1: Identify the voltage (V) in the AC circuit.
  • Step 2: Identify the current (I) flowing through the circuit.
  • Step 3: Determine the phase angle (θ) between the voltage and current. This angle is usually given in degrees or radians.
  • Step 4: Calculate the cosine of the phase angle (cos(θ)). You can use a calculator for this step.
  • Step 5: Multiply the voltage (V) by the current (I) and then by the cosine of the phase angle (cos(θ)).
  • Step 6: The result from Step 5 is the power (P) in the AC circuit.
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