THE PRACTICE STUDIO
Go slowly. Ask why. Make it yours.
PRACTICE / AC power and power factor
Separate real power from impedance
A series circuit contains an ideal inductor and a resistor. At one frequency it draws 2.0 A RMS from a 100 V RMS source and absorbs average power 120 W.
Find the inductive reactance at this frequency.
Organize the givens & assumptions
- Vrms = 100 V
- Irms = 2.0 A
- Average power P = 120 W
Sinusoidal steady state; resistor accounts for all real power; ideal lossless inductor; no capacitor.
- A
- B
- C
- D
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