What is the role of inductance
Many people do not know the main three functions of inductance, the following small series to specific.
1, block traffic straight
For dc, inductance is equivalent to a short circuit, while for AC, inductance is a hindrance, the higher the ac frequency, the greater the inductance hindrance.
2. Transformer
Because the inductance can only change the voltage and current, but can not change the power, if the voltage and current are proportional is obviously unreasonable.
3. RL low pass filter
The signal passing through the inductor gets smaller and smaller until it reaches a certain frequency above which no current can pass. The low-pass filter is formed. This frequency is called the cutoff frequency, and the formula is f=R/ (2πL).
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Two, how to convert inductance units
1. Inductance unit is Henry, symbol is "H ".
2, inductance conversion: 1H=1000mH= 1000000 uH=1000,000,000nH=1000,000,000,000pH.
3. Inductance is divided into general inductance and precision inductance. The main difference is the error value of parts and the number of code bits on the surface of parts.
(1) General inductance: error value is ±20%, and its expression code is M; error value is ±10%, and its expression code is K.
(2) Precision inductance: error value is ±5%, and its expression code is J; error value is ±1%, and its expression code is F.