贴片电阻代码计算器 — 公式

Power Dissipation

P = V x I

Also: P = I^2 x R and P = V^2 / R.

All forms are equivalent via Ohm's Law.

计算示例

5 V across a component at 100 mA.

  1. P = 5 x 0.1 = 0.5 W = 500 mW
  2. Ensure component is rated above 0.5 W.