电源纹波计算器 — 公式

## Linear Regulator Efficiency

### Formula

**Efficiency = V_out / V_in x 100%**

Linear regulators are simple and low-noise but waste power as heat. Efficiency depends only on the voltage ratio, not on current. A 12V-to-5V linear regulator is only 42% efficient.

计算示例

12 V input, 5 V output, 1 A load.

  1. Efficiency = 5 / 12 x 100 = 41.7%
  2. Power delivered = 5 x 1 = 5 W
  3. Power wasted = (12 - 5) x 1 = 7 W