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Version 6.10
General Information
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Ohm's Law Formulae with Power and Impedance
 

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A) Power = P
B) Apparent Power = Pa
C) Current = I
D) Voltage = V
E) Resistance = R
F) Impedance = Z
Footnote:   is a tricky method of compensating for 1 and 3 phase power differences. The square root of 1 is 1 for single phase and 1.73 for three phase. Use 2 in place of   for 2 phase 4-wire and 1.414 (sqrt(2)) for 2 phase 3-wire.
     

It simply cannot be any easier or more accurate to obtain the correct information the first time.

 

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Reprinted with permission from NFPA 70 2008, NEC® copyright© 2008, National Fire Protection Association. This is not the complete and official position of the NFPA on the referenced subject which is represented only by the standard in its entirety. The title National Electric Code® and the acronym NEC® are registered trademarks of the National Fire Protection Association (NFPA).

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