What are the functions of capacitors and resistors?

A capacitor has the following functions:

1, filtering: filter out unnecessary AC components in DC power supply and smooth DC;

2. Decoupling: to prevent parasitic oscillation caused by positive feedback of internal resistance of power supply;

3. Bypass: avoid the attenuation of AC signal components caused by resistance voltage drop;

4. Coupling: DC can be cut off and AC signal or pulse signal can pass through, so the DC working points of the front and rear amplifier circuits do not affect each other.

2. The function of the resistor is as follows:

1. Current limiting: in order to ensure that the current passing through the electrical appliance does not exceed the rated value or the specified value required for actual work, so as to ensure the normal operation of the electrical appliance;

2. Shunt: Connect a resistor in parallel at both ends of the electrical appliance with smaller rated current, so that several electrical appliances with different rated currents can be connected to the main circuit at the same time;

3. Voltage division: Connect a resistor with appropriate resistance in series to share part of the voltage, so that the electrical appliance can work at the rated voltage.