电容放电时间计算器
计算电容器通过电阻放电的时间。
Ω
mH
Cutoff Frequency
15,915.5 Hz
Time Constant (L/R)0.0100 ms
Cutoff Frequency vs Resistance
公式
## RL Filter Cutoff **f_c = R / (2 x pi x L)** Time constant tau = L/R. An RL low-pass passes DC and attenuates high frequencies.
计算示例
R = 1k, L = 10 mH.
- 01L = 0.01 H
- 02f_c = 1000 / (2pi x 0.01) = 15,915.5 Hz
- 03tau = 0.01 / 1000 = 0.01 ms
常见问题
RL vs RC filter?
Same rolloff rate (-20 dB/decade), but RL uses an inductor where RC uses a capacitor.
Why use RL over RC?
RL filters handle DC current better. Useful in power supply filtering.
Inductor disadvantages?
Inductors are larger, heavier, and more expensive than capacitors for most filter applications.
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