(adsbygoogle = window.adsbygoogle || []).push({}); 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?

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Apparent power calculation

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