The Function Of Resistance In A Load Bank
In daily life, we often call load bank resistance R, with the unit of ohm. If we want to define resistance, it is the size of the conductor's resistance to current. Resistance is a current limiting element. The greater the resistance of the conductor to current, we say that its resistance is large, and vice versa. However, resistance does not disappear just because there is no current passing through the conductor. Resistance is an inherent property of a conductor. Even if there is no current flowing through the conductor, its resistance still exists.
The function of load bank resistance - voltage division
When a load bank resistor and another component such as a light bulb are in series in a circuit, the current flowing through the load bank resistor and the light bulb is the same, and the sum of the voltages of the load bank resistor and the light bulb is equal to the total voltage across the resistor and the light bulb as a whole. At this time, the resistor plays the role of voltage division.
The second function of the load bank resistor is shunt
When a load bank resistor and another component such as a light bulb are in parallel in the circuit, the voltage across the load bank resistor is the same as the voltage across the light bulb, and the sum of the current flowing through the load bank resistor and the current flowing through the light bulb is equal to the total current flowing through the resistor and the light bulb. At this time, the load bank resistor plays a shunt role.
The third function of the load bank resistor is impedance matching
Impedance matching refers to the process of using some methods to make the load impedance and the internal impedance of the excitation source adapt to each other in order to obtain a working state of high power output during the transmission of the signal. One of the methods is to achieve this by changing the impedance. In this case, the resistor plays its impedance matching role.
Function of load bank resistance 4 - filtering
In the RC charging and discharging circuit composed of load bank resistance and capacitor in series, the switch S is connected to point B at first, as shown in the figure below. There is no charge on capacitor C, and the voltage across it is zero. Then the switch S is placed at point A. At this time, the power supply starts to charge the capacitor through the resistor R. When the charge across the capacitor increases to the circuit balance, the power supply no longer charges the capacitor. Then the switch S is placed at point B, the capacitor starts to discharge, and the charge across it gradually decreases. When it decreases to zero, it no longer discharges. Then the switch S is placed at point A to start charging... In this infinite cycle of charging and discharging, we call the role played by the load bank resistance R a filtering role.
