When a resistor and another component such as a light bulb are in series in the circuit, the current flowing through the resistor and the light bulb is the same, and the sum of the respective voltages of the resistor and the light bulb is equal to the total voltage separated by the resistor and the light bulb as a whole. At this time, the role of the resistance spindle partial pressure.
The role of resistance two-shunt
When a resistor and another component such as a bulb are in parallel in the circuit, the voltage across the resistor is the same as the voltage across the bulb, and the sum of the current flowing through the resistor and the current flowing through the bulb is equal to the total current flowing through the resistor and the bulb . At this time, the front end of the resistor shunts.
The role of resistance three-resistance matching
Differential matching refers to a process in which some methods are used to alternately adapt to each other within the excitation source under load in order to obtain a working state of maximum power output during signal transmission. One of the methods is to achieve this by changing the amplitude force. In this case, the resistance in series is its substitute matching effect.
The role of resistance four-filtering
In the RC charging and discharging circuit composed of resistor and capacitors in series, at first the switch S is connected to point B. As shown in the figure below, the capacitor C is not inserted and the cross voltage is zero. After that, the switch S is connected to point A. At this time, the power supply Start to charge the capacitor through the resistor R. When the capacitor is connected in series to the maximum circuit balance, the power supply no longer charges the capacitor. Then, insert the switch S into point B, and the capacitor begins to discharge. Its length gradually decreases. When it is reduced to zero, it will no longer discharge. Then insert the switch S into point A to start charging... In this infinite cycle of charging and discharging, we call the role of the resistance R conversion as a function.
The role of resistance-special resistance
Special resistor are made of semiconductor materials, and their resistance value can also be changed, but unlike variable resistor, the resistance of variable resistor can be adjusted manually, while the resistance of special resistor is in external environmental conditions. . The resistance of a certain thermistor is corrected as the temperature rises. When used in a circuit, the temperature can be judged according to its resistance and used as a thermal sensor; the resistance of a photoresistor greatly shifts when there is light, and in the circuit It can be used as an optical switch; the resistance of the varistor changes with the change of their mutual voltage, which can prevent the protective effect in the circuit, and the protection circuit should not be damaged due to voltage fluctuations. There is also the most special type of resistor is a superconductor element, which does not generate heat when conducting electricity. The computer element does not require a cooling system when it is made, which can greatly reduce the size and loss of the computer.