{"id":1875,"date":"2026-09-14T15:05:28","date_gmt":"2026-09-14T15:05:28","guid":{"rendered":"https:\/\/physicsfundamentalsinfo.com\/blog\/?p=1875"},"modified":"2026-09-14T15:05:30","modified_gmt":"2026-09-14T15:05:30","slug":"watts-to-amps","status":"publish","type":"post","link":"https:\/\/physicsfundamentalsinfo.com\/blog\/electromagnetism\/watts-to-amps\/","title":{"rendered":"Watts to Amps: Conversion and Formula"},"content":{"rendered":"\n
Definition<\/div>

\nWatts to amps is the conversion from the power a load uses to the current it draws: divide the watts by the volts, I = P \/ V. On single-phase AC you also divide by the power factor, I = P \/ (V \u00d7 PF), and on balanced three-phase by sqrt(3) as well, with V the line-to-line voltage.\n<\/p><\/div>\n\n

Turn over a kettle, a toaster or a fan heater and the label almost always gives you watts and volts. The figure that decides whether a plug, a lead or a circuit is being asked for too much is in amps, and the label rarely prints it.<\/p>\n\n

Getting from one to the other takes a single division, provided you know which voltage to divide by. That proviso is the whole story. The same 2000 W rating means nearly twice the current in a North American kitchen that it does in a British one, and a modest 60 W lamp on a car battery pulls more current than most people would guess.<\/p>\n\n

The Watts to Amps Formula<\/h2>\n\n

To convert watts to amps, divide the power by the supply voltage, and on AC divide by the power factor as well. Three versions cover almost every supply you will meet:<\/p>\n\n

I = P \/ V (DC)<\/div>\n\n
I = P \/ (V \u00d7 PF) (single-phase AC)<\/div>\n\n
I = P \/ (sqrt(3) \u00d7 V \u00d7 PF) (balanced three-phase AC)<\/div>\n\n