エネルギー単位変換ツール

ジュール、kWh、BTU、カロリー

Required Parameters

Input value

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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.

Documentation

エネルギー単位換算ツール

ジュール、キロワット時、カロリー、BTU、電子ボルトの間でエネルギーを換算します。

主な換算

1 kWh = 3,600,000 J
1 BTU = 1,055.06 J
1 cal = 4.184 J

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.