如何计算Ohm's Law

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Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R): V = IR. It is the foundation of electrical circuit analysis. Power (P = VI = I²R = V²/R) describes the energy converted per second.

分步指南

1. 1Identify any two known values: voltage (V), current (A), or resistance (Ω)
2. 2Rearrange: V = IR, I = V/R, R = V/I
3. 3Calculate power: P = V × I = I²R = V²/R
4. 4Apply units: Volts (V), Amperes (A), Ohms (Ω), Watts (W)

例题解析