Watts to Amps Calculator
Calculate the Current (Amperes) flowing through a circuit given the Power (Watts) and Voltage (Volts).
Circuit Details
Electrical Current
How to Convert Watts to Amperes
If you know how much power an appliance consumes (Watts) and the voltage of the electrical outlet it is plugged into (Volts), you can use the Power Equation to calculate the electrical current (Amps) it draws. This is essential for preventing tripped circuit breakers and sizing electrical wires.
The Power Equation Formula
- DC Current Formula:
Amps = Watts / Volts - AC Single Phase Formula:
Amps = Watts / (Volts × Power Factor)
Frequently Asked Questions
What is the Power Factor (PF)?
In AC circuits, the Power Factor represents how effectively electrical power is being converted into useful work output. For purely resistive loads like heaters and incandescent bulbs, the PF is exactly 1.0. For inductive loads like refrigerators and motors, it is typically around 0.8.
Why does the type of current matter?
Direct Current (DC) flows in one direction and has a constant voltage, making the math a simple division task. Alternating Current (AC) oscillates, meaning the voltage and current waveforms can be out of sync (which is what the Power Factor corrects for). Three-phase AC requires an additional multiplier (the square root of 3) to accurately measure phase offsets.