Electrical Formulas & Amp; Equations
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Electrical Formulas & Amp; Equations
Convert Watts to AMPS:
- AMPS = Watts / Voltage (2,300 WATTS = 2300w divided by 120v = 19.1 AMPS)
- for 3 Phase divide by 1.73
Convert AMPS to Watts:
- Watts = Voltage x Amps (19.1 AMPS multiplied by 120v = 2300 Watts)
- for 3 phase multiply by 1.73
Convert Horse Power to AMPS:
- HORSEPOWER = (V x A x EFF)÷746
- EFFICIENCY = (746 x HP)÷(V x A)
- Multiply Horse Power by 746w (1 HP = 746 Watts)
- Find Circuit Voltage and Phase
- 30 HP at 480 (3 Phase) - 746 multiplied by 30 = 22380
- 22380 divided by 480 (3 Phase) = 46.5
- 46.5 divided by 1.73 = 29.5AMPS
- Multiply all the motor loads by 1.50% and go to the next circuit size
Convert KVA to AMPS:
- Multiply KVA by 1000/voltage
- 30 KVA multiplied by 1000v = 30,000 Watts
- 30,000 Watts divided by 480 = 62.5 AMPS
- for 3 phase divide by 1.73
Convert KW to AMPS:
- Multiply KW by 1000/voltage and then by power factor
- 30KW multiplied by 1000v = 30,000
- 30,000 divided by 480 = 62.5 x .90 = 56.25amps
- for 3 phase divide by 1.73