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基尔霍夫定律（KVL KCL）-RT 基尔霍夫电压定律（KVL） 这是基尔霍夫的第二定律。 电路回路中所有电压或电位差的总和为0。 KVL示例 V S = 12V， V R1 = -4V， V R2 = -3V V R3 =？ 解： ∑ V k = V S + V R1 + V R2 + V R3 = 0 V R3 = - V小号 - V R1 - V R2 = -12V + 4V + 3V = -5V 电压符号（+ -）是电位差的方向。
基尔霍夫定律 - 知乎 基尔霍夫电压定律，英文是 Kirchhoff's Voltage Law, 简写为 KVL。 基尔霍夫电压定律指出：闭合回路中电压升之和等于电压降之和（In any closed loop network, the total EMF is equal to the sum of Potential Difference drops ）。