In an AC circuit, what is the relationship between the average power and the RMS

Practice Questions

Q1
In an AC circuit, what is the relationship between the average power and the RMS voltage? (2023)
  1. P = V_rms²/R
  2. P = V_peak²/R
  3. P = V_rms/R
  4. P = V_peak/R

Questions & Step-by-Step Solutions

In an AC circuit, what is the relationship between the average power and the RMS voltage? (2023)
  • Step 1: Understand that in an AC circuit, we often use RMS (Root Mean Square) voltage to represent the effective voltage.
  • Step 2: Know that average power (P) is the power consumed by the circuit over time.
  • Step 3: The formula for average power in an AC circuit is P = V_rms²/R.
  • Step 4: In this formula, V_rms is the RMS voltage and R is the resistance of the circuit.
  • Step 5: This means that the average power is directly related to the square of the RMS voltage divided by the resistance.
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