Calculadora de kW para Amperes Logotipo
Calculadora de kW para Amperes
⚡ Conversão Elétrica

Amperes para Watts Calculadora

Determine rapidamente quantos watts o seu dispositivo consome inserindo a leitura em amperes e a tensão de entrada. Essencial para medir a eficiência de pequenos aparelhos.

Calculadora de Consumo

Amperes → Watts

Decimais
0
Potência Calculada
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W

Medição da potência ativa utilizada pela carga.

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A Fórmula de Conversão

O cálculo de potência depende do tipo de circuito — o fator de potência é necessário para todos os sistemas CA.

Sistemas CC
W = I × V

A equação fundamental de potência — amperes vezes volts é igual a watts em todos os circuitos DC.

CA Monofásica
W = I × V × PF

O fator de potência contabiliza a diferença de fase entre tensão e corrente, reduzindo a potência real efetiva.

CA Trifásica
W = √3 × I × V × PF

A potência trifásica equilibrada soma-se pelas três fases com o coeficiente √3 (1,732) para a tensão de linha.

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.