免费欧姆定律计算器
使用欧姆定律计算电压、电流和电阻的关系。
V
A
电阻
24.00 Ω
功率6.000 W
Resistance vs Voltage
公式
How Ohm's Law Works
Ohm's Law links voltage, current, and resistance.
Formula
V = I x R
Where:
Rearranging gives R = V / I and I = V / R. Power is P = V x I.
计算示例
A 12 V battery drives 0.5 A through a resistor.
- 01Resistance R = V / I = 12 / 0.5 = 24 ohms
- 02Power P = V x I = 12 x 0.5 = 6 W
常见问题
What is Ohm's Law?
Ohm's Law states that current is proportional to voltage and inversely proportional to resistance: V = I x R.
When does Ohm's Law not apply?
It does not apply to nonlinear devices like diodes and transistors where resistance changes with voltage or current.
How do I find current if I know voltage and resistance?
Rearrange to I = V / R. For example, 12 V across 24 ohms gives 0.5 A.
学习