Electrical

# 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.

Watts to Amps Calculator

## Watts to Amps Calculator

This wattage calculator is provided for estimation purposes only and should not be considered professional advice. We are not liable for any inaccuracies or errors resulting from user input or application of the calculator's results. Users are responsible for verifying the output with a qualified professional and adhering to local codes and regulations.

### 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

• 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 (240V)

Author

Hubert Miles | Licensed Home Inspector, CMI, CPI

Hubert Miles is a licensed home inspector (RBI# 2556) with more than two decades of experience in inspection and construction. Since 2008, he has been serving South Carolina through his company, Patriot Home Inspections LLC. As a Certified Master Inspector, Hubert is dedicated to providing his expertise in home inspections, repairs, maintenance, and DIY projects.