Formula wheel
- Thread starter mrswib
- Start date
- Status
Re: Formula wheel
P = Power or watts
E = Voltage
R = Resistance
I = Current or Amperes
Try this web site for formula information:
http://www.eescodist.com/ugly/
P = Power or watts
E = Voltage
R = Resistance
I = Current or Amperes
Try this web site for formula information:
http://www.eescodist.com/ugly/
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: Formula wheel
There are only two independent formulas for power. One applies to single phase (S = E x I), the other to three phase (S = E x I x 1.732). All other formulas can be derived from the two. Variations on the single phase formula include S = I x I x R and S = V x V / R. Note that I used ?S? (apparent power, in VA) instead of ?P? (real power, in watts). Multiply ?S? by ?power factor? to get ?P.?
What are the two formulas you used, what input information did you have (e.g., current or voltage or resistance values), and what are the two different answers that you got?
There are only two independent formulas for power. One applies to single phase (S = E x I), the other to three phase (S = E x I x 1.732). All other formulas can be derived from the two. Variations on the single phase formula include S = I x I x R and S = V x V / R. Note that I used ?S? (apparent power, in VA) instead of ?P? (real power, in watts). Multiply ?S? by ?power factor? to get ?P.?
What are the two formulas you used, what input information did you have (e.g., current or voltage or resistance values), and what are the two different answers that you got?
charlie
Senior Member
- Location
- Indianapolis
Re: Formula wheel
I think this is another test question.
I think this is another test question.
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