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Inst Tools > Blog > Electrical Theory > Calculate Power in Parallel RC Circuit

Calculate Power in Parallel RC Circuit

Last updated: August 2, 2018 12:37 am
Editorial Staff
Electrical Theory
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A 30 Ω resistance and a 40 Ω XC are in parallel with a 120V power source, as shown in Figure.

Calculate Power in Parallel RC Circuit

Figure : Parallel R-C Circuit

Find:

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

Solution:

1.Current, IT

Calculate Current in Parallel RC Circuit

IT = 5 amps

2. Calculate Z

Z = VT/IT

Z = 120/5

Z = 24 Ω

3. Calculate Power factor (pf)

Calculate Power Factor in Parallel RC Circuit

p.f. = 0.8

4. Calculate True Power, P

P = EI cos θ

P = (120)(5)(0.8)

P = 480 watts

5. Calculate Reactive Power, Q

Q = EI sin θ

Q = (120)(5)(0.6)

Q = 360 VAR

6. Calculate Apparent Power, S

S = EI

S = (120)(5)

S = 600 VA

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