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# Electrical Formulas & Amp; Equations

• Voltage = Watts / AMPS

### 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