Watts to Amps Calculator: DC/AC Wattage to Amps Conversion

This Watts to Amps Calculator conversion tool converts electric power in watts (W) to electric current in amps (A). This calculator is useful for engineers, electricians, and individuals working with electrical systems.

Features

• Watts to Amps Conversion: Convert power in watts to current in amps.
• Amps to Watts Conversion: A complementary tool for converting current back to power.
• Support for Different Current Types: Calculate for Direct Current (DC), Alternating Current (AC) Single Phase, and AC Three Phase.
• Scientific Notation: Input values in standard or scientific notation (e.g., 5e3 for 5000).

Usage Instructions

1. Select Current Type: Choose from DC, AC Single Phase, or AC Three Phase.
2. Enter Power: Input the power in watts. For kilowatts, convert to watts (1 kW = 1000 W).
3. Enter Voltage: Input the voltage in volts. Millivolts can be converted to volts (1 mV = 0.001 V).
4. Calculate: Press the calculate button to convert watts to amps.
5. View Results: Current in amps and milliamps will be displayed.

Calculation Formulas

DC Watts to Amps: I(A) = P(W) / V(V)

• Example: For 200 watts at 40 volts, I = 200W / 40V = 5A

AC Single Phase Watts to Amps: I(A) = P(W) / (PF × V(V))

• Power factor (PF) typically equals 1 for resistive loads.
• Example: For 2000 watts at 110 volts with a PF of 0.8, I = 2000W / (0.8 × 110V) = 22.72727A

AC Three Phase Watts to Amps:

• Line to Line Voltage: I(A) = P(W) / (√3 × PF × VL-L(V))
• Line to Neutral Voltage: I(A) = P(W) / (3 × PF × VL-N(V))
• The power factor usually equals 1 for resistive loads.

Typical Power Factor Values

• Resistive Load: 1
• Fluorescent Lamp: 0.95
• Incandescent Lamp: 1
• Induction Motor (Full Load): 0.85
• Induction Motor (No Load): 0.35
• Resistive Oven: 1
• Synchronous Motor: 0.9

Note: Specific power factor values should be used for accurate calculations rather than these typical values.

Watts to amps table (120V)

Power (W)	Voltage (V)	Current (A)
10 watts	120 volts	0.0833 amps
20 watts	120 volts	0.167 amps
30 watts	120 volts	0.250 amps
40 watts	120 volts	0.333 amps
50 watts	120 volts	0.417 amps
60 watts	120 volts	0.500 amps
70 watts	120 volts	0.583 amps
80 watts	120 volts	0.667 amps
90 watts	120 volts	0.750 amps
100 watts	120 volts	0.833 amps
200 watts	120 volts	1.667 amps
300 watts	120 volts	2.500 amps
400 watts	120 volts	3.333 amps
500 watts	120 volts	4.167 amps
600 watts	120 volts	5.000 amps
700 watts	120 volts	5.833 amps
800 watts	120 volts	6.666 amps
900 watts	120 volts	7.500 amps
1,000 watts	120 volts	8.333 amps
1,100 watts	120 volts	9.167 amps
1,200 watts	120 volts	10.000 amps
1,300 watts	120 volts	10.833 amps
1,400 watts	120 volts	11.667 amps
1,500 watts	120 volts	12.500 amps
1,600 watts	120 volts	13.333 amps
1,700 watts	120 volts	14.167 amps
1,800 watts	120 volts	15 amps
2,400 watts	120 volts	20 amps

Watts to amps table (240V)

Power (W)	Voltage (V)	Current (A)
3,600 watts	240 volts	15 amps
4,800 watts	240 volts	20 amps
7,200 watts	240 volts	30 amps
9,600 watts	240 volts	40 amps
12,000 watts	240 volts	50 amps
14,400 watts	240 volts	60 amps
16,800 watts	240 volts	70 amps
19,200 watts	240 volts	80 amps
21,600 watts	240 volts	90 amps
24,000 watts	240 volts	100 amps
30,000 watts	240 volts	125 amps
36,000 watts	240 volts	150 amps
48,000 watts	240 volts	200 amps