- #1
james123
Homework Statement
For the circuit given in FIGURE 1 the power factor is 0.72 lagging and the power dissipated is 375 W.
Determine the:
- (i) apparent power
- (ii) reactive power
- (iii) the magnitude of the current flowing in the circuit
- (iv) the value of the impedance Z and state whether circuit is inductive or capacitive.
The Attempt at a Solution
(i)Power factor=true power/apparent power
So, Apparent power =true power/power factor
=375/0.72= 520.83 VA
(ii) Reactive power= √Apparent power^2-truepower^2
=√520.83^2-375^2
=361.44 VAR
(iii) P=VI
So, I=P/V
=520.83/120
=4.34 A
(iiii) Impedance= Vs/I
=120/4.34
=27.658 Ω
The circuit is inductive because it has a lagging power factor.Can anybody confirm if I am along the right lines with this/ where I've messed up?
Any help is appreciated!
Many thanks.
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