750 Watts to Amps
750 W is 3.261 A at 230 V and 6.25 A at 120 V (single-phase, power factor 1). Table for DC and three-phase, power factor 0.8, and the formula.
Formula
Worked example
- I = 750 / (230 × 1) = 3.261 A
- With a power factor of 0.9: I = 750 / (230 × 0.9) = 3.623 A
On other supplies
| Supply | Voltage | Current at pf 1 | Current at pf 0.8 |
|---|---|---|---|
| DC | 12 V | 62.5 A | not used |
| DC | 24 V | 31.25 A | not used |
| DC | 48 V | 15.63 A | not used |
| Single-phase | 120 V | 6.25 A | 7.813 A |
| Single-phase | 230 V | 3.261 A | 4.076 A |
| Single-phase | 240 V | 3.125 A | 3.906 A |
| Three-phase | 208 V | 2.082 A | 2.602 A |
| Three-phase | 400 V | 1.083 A | 1.353 A |
| Three-phase | 415 V | 1.043 A | 1.304 A |
| Three-phase | 480 V | 0.9021 A | 1.128 A |
Three-phase rows use the line-to-line voltage. DC ignores the power factor.
What 750 W looks like
750 W is close to one mechanical horsepower of motor output (1 HP is 745.7 W). A motor draws more electrical power than it delivers, because it is not 100% efficient.
This is an estimate of the load current only. Choosing a cable or a breaker also needs the installation method, the ambient temperature, the voltage drop and the rules you work to.
Frequently asked questions
How many amps is 750 watts?
750 W is 3.261 A on a 230 V single-phase supply and 6.25 A on 120 V, both with a power factor of 1. The current depends on the voltage, so it is a different answer on every supply.
What if the power factor is not 1?
The current rises. At 230 V and a power factor of 0.9, 750 W draws 3.623 A. Heaters and filament lamps are close to 1, while motors and many power supplies are lower.
What about a three-phase supply?
750 W on 400 V three-phase at a power factor of 0.8 is 1.353 A. The line voltage is used with the factor √3 (about 1.732).
Related
Watts to Amps CalculatorkW to Amps600 W to A800 W to A1,000 W to APower ConverterConversion Centre