Energy Conversion
BTU and joules
Required Parameters
Waiting for input data...
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.
Calculateur de Conversion d'Energie
Convertissez entre unites d'energie: Joules, kilowattheures, calories, BTU et electronvolts.
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
Comment convertir des joules en kWh ?
1 kWh = 3 600 000 J = 3,6 MJ. Inversement : 1 J = 2,778 × 10⁻⁷ kWh. L'énergie stockée dans un condensateur est E = ½CV² (en joules).
Related Engineering Tools
Battery Life Calculator
Estimate runtime from capacity and load current
Capacitor Safety Discharge Calculator
Solve discharge time or resistor value
dBm to Watts Conversion
RF power conversion both ways
Three Phase Calculator
Real, apparent, and reactive power