Conversor de Energia
Joules, kWh, BTU e calorias
Required Parameters
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Quick Answer
1 Joule = 1 Watt-second. 1 kWh = 3,600,000 J = 3.6 MJ. 1 BTU = 1,055 J. 1 calorie = 4.184 J. Energy conversion is fundamental for comparing electrical, thermal, and mechanical power sources.
Calculadora de Conversao de Energia
Converta entre unidades de energia.
Design Notes
In electronics, energy is most commonly expressed in watt-hours (Wh) for batteries and kWh for mains power. Joules appear in capacitor energy calculations (E = ½CV²) and ESD specifications.
Common Mistakes
- 1
Confusing energy (Joules, kWh) with power (Watts) — power is the RATE of energy transfer.
- 2
Mixing up calories (cal, 4.184 J) with food Calories (Cal = kcal = 4,184 J).
- 3
Comparing battery capacity in mAh across different voltages without converting to Wh first.
Knowledge Base
Quanto é 1 Joule em watt-segundo?
Exatamente igual. 1 J = 1 W·s. 1 kWh = 3.600.000 J = 3,6 MJ.
O que é BTU?
1 BTU = 1.055 J. Energia para aquecer 1 libra de água em 1°F. Usado em HVAC.
Energia armazenada em um capacitor?
E = ½CV² em joules. 1000µF a 400V = 80J. Pilha AA ≈ 13.500J.
Diferença entre energia e potência?
Energia (J, kWh) = trabalho total. Potência (W) = taxa. P × t = E.
O que é elétron-volt?
1 eV = 1,602×10⁻¹⁹ J. Usado em semicondutores. Bandgap do silício = 1,12 eV.
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