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P = VR IR
Where:
  P = true power in watts
VR = voltage across the resistance
in volts (RMS)
IR = current through the resistance
in amperes (RMS).
P = V cos Φ I
P = V I cos Φ
Where:
P = true power in watts
V = supply voltage in volts (RMS)
I = current taken from the supply
in amperes (RMS)
Φ = phase difference between the
supply voltage and the supply
current.
P = VI

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7.2.1 True Power

  • 1.
  • 2.
  • 3. P = VR IR Where: P = true power in watts VR = voltage across the resistance in volts (RMS) IR = current through the resistance in amperes (RMS).
  • 4.
  • 5.
  • 6.
  • 7. P = V cos Φ I
  • 8.
  • 9. P = V I cos Φ Where: P = true power in watts V = supply voltage in volts (RMS) I = current taken from the supply in amperes (RMS) Φ = phase difference between the supply voltage and the supply current.