- #1
Angusbrooks
- 2
- 0
A circuit has a power factor 0.72 lagging and the power dissipated is 375w.
Determine:
(A) Apparent power
Relevant equations:
ohms law V = I x R
apparent power (S) = supply voltage (Vs) x Current (I)
Attempt:
Current =
Voltage
Resistance
120v
10Ω
= 12Amps
∴ Apparent power (S) = Supply voltage (Vs) x Current (I)
120V x 12 Amps
= 1440 VA
I have seen another equation where it states that true power is the power dissipated at 375W therefore my second attempt which I am very unsure of as I cannot locate the stated equation within my book:
altenative attempt
S (Apparent power) =
P (True power)
PF (power factor)
375W
0.72
= 520.83333
please help?
Determine:
(A) Apparent power
Relevant equations:
ohms law V = I x R
apparent power (S) = supply voltage (Vs) x Current (I)
Attempt:
Current =
Voltage
Resistance
120v
10Ω
= 12Amps
∴ Apparent power (S) = Supply voltage (Vs) x Current (I)
120V x 12 Amps
= 1440 VA
I have seen another equation where it states that true power is the power dissipated at 375W therefore my second attempt which I am very unsure of as I cannot locate the stated equation within my book:
altenative attempt
S (Apparent power) =
P (True power)
PF (power factor)
375W
0.72
= 520.83333
please help?