Electric current in amps (A) to electric power in watts (W) calculator.
Ampere (A) is a unit of electric current. Electric current is the rate of electric charge flow per time unit. One ampere (A) is equal to one coulomb (Q) per second (s).
Watt (W) is a unit of power. Power is the rate of energy usage per time unit. One watt (W) is equal to one joule (J) per second (S).
The power P in watts (W) is equal to the current I in amps (A), times the voltage V in volts (V):
The power P in watts (W) is equal to the power factor PF times the phase current I in amps (A), times the RMS voltage V in volts (V):
The power P in watts (W) is equal to square root of 3 times the power factor PF times the phase current I in amps (A), times the line to line RMS voltage VL-L in volts (V):
The power P in watts (W) is equal to 3 times the power factor PF times the phase current I in amps (A), times the line to neutral RMS voltage VL-N in volts (V):
Do not use typical power factor values for accurate calculations.
| Device | Typical power factor |
|---|---|
| Resistive load | 1 |
| Fluorescent lamp | 0.95 |
| Incandescent lamp | 1 |
| Induction motor full load | 0.85 |
| Induction motor no load | 0.35 |
| Resistive oven | 1 |
| Synchronous motor | 0.8 |
| Current (A) | Voltage (V) | Power (W) |
|---|---|---|
| 0.1 amps | 120 volts | 12 watts |
| 0.2 amps | 120 volts | 24 watts |
| 0.3 amps | 120 volts | 36 watts |
| 0.4 amps | 120 volts | 48 watts |
| 0.5 amps | 120 volts | 60 watts |
| 0.6 amps | 120 volts | 72 watts |
| 0.7 amps | 120 volts | 84 watts |
| 0.8 amps | 120 volts | 96 watts |
| 0.9 amps | 120 volts | 108 watts |
| 1 amps | 120 volts | 120 watts |
| 2 amps | 120 volts | 240 watts |
| 3 amps | 120 volts | 360 watts |
| 4 amps | 120 volts | 480 watts |
| 5 amps | 120 volts | 600 watts |
| 6 amps | 120 volts | 720 watts |
| 7 amps | 120 volts | 840 watts |
| 8 amps | 120 volts | 960 watts |
| 9 amps | 120 volts | 1080 watts |
| 10 amps | 120 volts | 1200 watts |
At 240V, 1 amp equals 240 watts using the formula P = V × I (Power = Voltage × Current). This calculation applies to resistive loads like heaters, incandescent bulbs, and electric kettles where power factor equals 1.
Answer: To calculate watts from amps, multiply current (amps) by voltage using P = V × I formula. For example: 1 amp × 120V = 120 watts, or 1 amp × 240V = 240 watts depending on your electrical system voltage.
Answer: At 220V, 1 amp equals 220 watts for resistive electrical loads. This voltage is common in many countries and the calculation follows Ohm’s Law: Power (watts) = Voltage (220V) × Current (1 amp).
Answer: 10 amps at 220V equals 2,200 watts (2.2 kW) for resistive loads. This power level is typical for high-demand appliances like electric water heaters, air conditioners, or multiple household devices running simultaneously.
Answer: Use the electrical power triangle: Watts = Volts × Amps, Volts = Watts ÷ Amps, Amps = Watts ÷ Volts. These formulas help calculate any unknown value when you have two known electrical parameters for safe circuit design.
Answer: At 12V DC, 1 amp equals 12 watts, commonly used in automotive, RV, and solar applications. This low-voltage calculation is essential for battery systems, LED lighting, and 12V appliances in mobile or off-grid setups.
Answer: 16 amps at 220V equals 3,520 watts (3.52 kW) for resistive loads. This amperage is typical for dedicated circuits serving electric ovens, large air conditioning units, or electric vehicle charging stations.
Answer: At 440V (industrial voltage), 1 amp equals 440 watts for single-phase resistive loads. This voltage is common in industrial three-phase systems where line-to-line voltage reaches 440V for heavy machinery and large motors.
Answer: You cannot convert amps to watts without knowing the voltage, as watts = volts × amps according to electrical power law. Voltage is essential because the same current at different voltages produces vastly different power outputs.
Answer: DC power calculations use P = V × I directly, while AC power calculations may require power factor consideration: P = V × I × PF. For resistive AC loads, power factor equals 1, making calculations identical to DC.
Answer: A 15 amp circuit at 120V can safely handle 1,440 watts (80% of 1,800W maximum capacity). The National Electrical Code requires continuous loads stay below 80% capacity for safety and code compliance.
Answer: At 120V, 1 amp powers 120-watt devices like LED light strips, small fans, phone chargers, or laptop computers. At 240V, 1 amp can power 240-watt appliances like small space heaters or power tools.