🔋 電気変換
アンペアから kW 計算機
電流と電圧を入力して、キロワット単位の電力を求めます。電力消費と機器性能の測定に不可欠です。
測定入力
電流 → 電力
小数点以下
3
計算された電力
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kW
キロワットは実際に行われている仕事量を表します。
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計算式
電力計算は直流と交流の環境で異なります。
直流システム
P(kW) = (I × V) / 1000 位相変数を使わない直接的な電力測定です。
単相AC
P = (I × V × PF) / 1000 単線の住宅用および商業用システムに使用されます。
三相AC
P = (√3 × I × V × PF) / 1000 重機械や産業用グリッドの標準です。
How to Convert Amps to Kilowatts
Converting amperes to kilowatts tells you how much real power a circuit is delivering — essential for energy monitoring, billing verification, generator load assessment, and equipment sizing. Because voltage and system type (DC vs. AC) affect the result, you cannot convert amps to kW without knowing the supply voltage and, for AC systems, the power factor.
Key Takeaway
Amps alone tell you nothing about power — a 10A current at 12V delivers just 120W, while the same 10A at 240V delivers 2,400W. Always include voltage and power factor when converting to kilowatts for accurate results.
Common Use Cases
- Energy Monitoring: Smart meters and clamp meters measure current. Multiply by voltage and PF to get real kW demand for utility billing cross-checks.
- Generator Load Assessment: Sum the kW of connected loads to verify you're not exceeding generator rated output.
- Solar System Input: Calculate the kW input from your charge controller's amp reading and battery voltage.
- Motor Power Verification: Confirm a motor is delivering its rated kW output by measuring its input current and accounting for efficiency.
Step-by-Step Conversion Guide
- Measure or Find the Current: Use a clamp meter for live readings or the nameplate FLA (Full Load Amps) for rated values.
- Confirm the Supply Voltage: Check the panel label or equipment nameplate — never assume.
- Determine Power Factor: For DC or pure resistive loads, use PF = 1.0. For motors and mixed AC loads, use the nameplate PF or a typical value of 0.85.
- Select the Circuit Type: DC, single-phase AC, or three-phase AC — each uses a different formula.
- Calculate: Apply the appropriate formula and the result is real power in kilowatts.