エネルギー 単位変換ツール
ジュール、kWh、BTU、カロリー
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.
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Calculadora de Conversao de Energia
Converta entre unidades de energia: Joules, quilowatt-hora, calorias, BTU e eletron-volts.
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
1ジュールは何ワット秒？
完全に同じ。1J = 1W·s。1kWh = 3,600,000J = 3.6MJ。
BTUとは？
1BTU = 1,055J。1ポンドの水を1°F上昇させるエネルギー。空調で使用。
コンデンサのエネルギーは？
E = ½CV²（ジュール）。1000µF×400V = 80J。単三電池 ≈ 13,500J。
エネルギーと電力の違いは？
エネルギー（J, kWh）= 総仕事量。電力（W）= 仕事率。電力 × 時間 = エネルギー。
電子ボルト（eV）とは？
1eV = 1.602×10⁻¹⁹J。半導体物理で使用。シリコンバンドギャップ = 1.12eV。
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