kW till Ampere Kalkylator Logotyp
kW till Ampere Kalkylator
⚡ Elektrisk Omvandling

Ampere till Watt Kalkylator

Ta snabbt reda på exakt hur många watt din enhet använder genom att ange dess ampere-värde och inkommande spänning. Viktigt för att mäta effektiviteten hos små apparater.

Förbrukningskalkylator

Ampere → Watt

Decimaler
0
Beräknad Effekt
—
W

Mätning av den aktiva effekten som används av lasten.

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Omvandlingsformeln

Effektberäkningen beror på din kretstyp — effektfaktor krävs för alla växelströmssystem.

DC-system
W = I × V

Den grundläggande effektekvationen — ampere gånger volt är lika med watt i alla DC-kretsar.

1-fas AC
W = I × V × PF

Effektfaktorn tar hänsyn till fasskillnaden mellan spänning och ström, vilket minskar den effektiva verkliga effekten.

3-fas AC
W = √3 × I × V × PF

Balanserad trefaseffekt summeras över alla tre faserna med koefficienten √3 (1,732) för linjespänning.

How to Convert Amps to Watts

Converting amperes to watts tells you how much real power a device consumes. This is essential for calculating energy costs, sizing generators, verifying circuit capacity, and comparing appliances. Multiply amps by volts — then apply the power factor for AC systems.

Real Power vs. Apparent Power

Real power (watts) is energy that actually does work — turning a motor, heating an element. Apparent power (VA) is what the supply delivers including reactive current. For heaters and lamps they're equal. For motors and transformers, watts are always lower than VA because some current builds magnetic fields without doing useful work.

Practical Applications

  • Energy Cost Calculation: Convert amps to watts, multiply by hours of use to get Wh, divide by 1000 for kWh, then multiply by your electricity tariff.
  • Generator Sizing: Sum the watts of all simultaneous loads and add 25% for motor startup surges.
  • Circuit Load Audit: Sum all load watts on a circuit. The total should not exceed 80% of the breaker rating × voltage (NEC continuous load rule).

Step-by-Step Conversion

  1. Read the Current: Measure with a clamp meter or find the amp rating on the device nameplate.
  2. Note the Voltage: Check your supply — 120V or 240V in North America; 230V in most of Europe.
  3. Apply Power Factor: Use 1.0 for pure resistive loads. Use 0.8–0.9 for motors and inductive equipment.
  4. Multiply: I × V for DC; I × V × PF for single-phase AC; √3 × I × V × PF for three-phase AC.