The difference and characteristics of inductance and capacitance
Inductors and capacitors are widely used in electronic circuits and inductive load circuits. The differences and characteristics are as follows:
The construction of capacitance: a layer of insulating dielectric is sandwiched between two metal electrodes;Symbol of capacitance: C;The unit of capacitance: farad (F).Energy exists in the form of an electric field, voltage is formed.The structure of inductance: a variety of coils made of insulated wires;Symbol of capacitance: L;Unit of capacitance: Henry (H).The energy comes in the form of a magnetic field and electricity is generated.
Capacitance characteristics: 1. The faster the voltage changes, the greater the current generated; 2.2, ac, dc resistance.In fact, the ac is not through the capacitor, but the continuous charge and discharge process of the capacitor.
Inductance characteristics: 1, the faster the current changes, the greater the induced voltage;2, direct current, resistance to ac.The induced electromotive force produced by ac passing through the inductor is opposite to the original electromotive force.
Capacitive current is 90 degrees ahead (relative to voltage).In stage 0-t /2, when the voltage comes from nothing, the change is the largest, and the current is the largest.As the voltage increases, the rate of current change decreases, and so does the current. As can be seen from the figure above, the waveform of current I is 90 degrees ahead of the waveform of voltage u (the same analysis for other stages).Memory method: the capacitive reactance of the capacitor inhibits the voltage increase, so the voltage lags behind the current.
Inductance current lags by 90 degrees (relative to voltage).In stage 0-t /2, when the current comes from nothing, the rate of current change is the largest, and the voltage is the largest.As the current increases, the voltage change rate decreases, and the voltage also decreases. As can be seen from the figure above, the waveform of current I lags behind the waveform of voltage u by 90 degrees (the same analysis for other stages).Memory method: inductive reactance of inductance inhibits current increase, so current lags behind voltage.
The key word for this information is： characteristics frequency inductor principle transformer inductive Definition common selection working Design difference inductance resonant differential
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