How to find Amp (Amperes) in ac and dc
Category: Electrical Articles
29 Sep 14
E = Voltage
I = Amps
PF = Power Factor
Eff = Efficiency
HP = Horsepower
Formula for finding Amperes when Horsepower is known in direct current (dc) and alternative current (ac):
| To Find (Formula) |
Direct Current (DC) | Alternating Current | ||
|---|---|---|---|---|
| Single Phase | Two Phase / Four Wire | Three Phase | ||
| Amperes when Horsepower is known |
HP X 746
—————— E X EFF
|
HP X 746
—————— 2 X E X EFF X PF
|
HP X 746
—————– 2 X E X EFF X PF
|
HP X 746
—————- E X EFF X PF X 1.73
|
Formula for finding Amp when Kilowatts is known in direct current (dc) and alternative current (ac):
| To Find (Formula) |
Direct Current (DC) | Alternating Current | ||
|---|---|---|---|---|
| Single Phase | Two Phase / Four Wire | Three Phase | ||
| Amperes when Kilowatts is known |
KW X 1000
—————— E
|
KW X 1000
—————— E X PF
|
KW X 1000
—————– 2 X E X PF
|
KW X 1000
—————- E X PF X 1.73
|
Formula for finding Amp when KVA is known in direct current (dc) and alternative current (ac):
| To Find (Formula) |
Direct Current (DC) | Alternating Current | ||
|---|---|---|---|---|
| Single Phase | Two Phase / Four Wire | Three Phase | ||
| Amperes when KVA is known |
KVA X 1000
—————— E
|
KVA X 1000
—————– 2 X E
|
KVA X 1000
—————- E x 1.73
|
|
Formula for finding Kilowatts in direct current (dc) and alternative current (ac):
| To Find (Formula) |
Direct Current (DC) | Alternating Current | ||
|---|---|---|---|---|
| Single Phase | Two Phase / Four Wire | Three Phase | ||
| Kilowatts |
E X I
—————— 1000
|
E X I X PF
—————— 1000
|
I X E X 2 X PF
—————– 1000
|
E X I X 1.73 X PF
—————- 1000
|
