Amps to watts
15 A at 120 V = 1800 W
For any other value: W = A × V
Calculator
1800 W
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You can leave the unit in: 100 A is fine.
Watts and amps are not the same quantity: without the voltage there is no conversion. Any page giving you a single number is assuming one.
Amps to watts chart
The values people look up most.
| amps | watts |
|---|---|
| 15 A | 1800 W |
| 1 A | 120 W |
| 20 A | 2400 W |
| 10 A | 1200 W |
| 30 A | 3600 W |
| 3 A | 360 W |
| 5 A | 600 W |
| 2.4 A | 288 W |
| 12 A | 1440 W |
| 2 A | 240 W |
| 50 A | 6000 W |
| 2.1 A | 252 W |
| 100 A | 12000 W |
| 1.5 A | 180 W |
| 13 A | 1560 W |
| 3.1 A | 372 W |
| 200 A | 24000 W |
| 1500 A | 180000 W |
| 8 A | 960 W |
| 6 A | 720 W |
| 2.5 A | 300 W |
| 7 A | 840 W |
| 4 A | 480 W |
| 40 A | 4800 W |
| 9 A | 1080 W |
| 6.5 A | 780 W |
| 60 A | 7200 W |
| 1000 A | 120000 W |
| 1.2 A | 144 W |
Formula
W = A × V
Where this number comes from
This factor is exact, not rounded. P = V·I is how the SI defines the watt, not an approximation.
Source: The International System of Units (SI Brochure), BIPM (Bureau International des Poids et Mesures).
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