How do you measure wattage on an electric arc welder?

To measure wattage on an electric arc welder, you need to determine both the voltage (V) and the current (I) being used during the welding process. Use a multimeter or clamp meter to measure the voltage and the amperage. Wattage can then be calculated using the formula: Watts (W) = Volts (V) × Amperes (A). This provides an estimate of the power consumption during welding.