Calculate Power in Parallel RL Circuit

A 600 Ω resistor and 200 Ω XL are in parallel with a 440V source, as shown in Figure.

Calculate Power in Parallel RL Circuit

Figure : Parallel R-L Circuit

Find:

  1. Current, IT
  2. Power Factor, pf
  3. True Power, P
  4. Reactive Power, Q
  5. Apparent Power, S

Solution:

1.Current, IT

Calculate Current in Parallel RL Circuit

IT  = 2.3 amps

2. Calculate Power factor (pf)

Calculate Power Factor in Parallel RL Circuit

p.f. = cos (- 71.5º)

p.f. = 0.32

3. Calculate True Power, P

P = EI cos θ

P = (440)(2.3)(0.32)

P = 323.84 watts

4. Calculate Reactive Power, Q

Q = EI sin θ

Q = (440)(2.3)(0.948)

Q = 959.4 VAR

5. Calculate Apparent Power, S

S = EI

S = (440)(2.3)

S = 1012 VA

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