Resistor is a common electronic component, which can be divided into packaging, resistance, power, style, specification, and variety. When designing the circuit, choose the resistance, packaging and power of the resistor according to your own needs.
The role of resistance in the circuit:
1. Resistor plays a role in current limiting in the circuit
In order to avoid the situation that the current exceeds the specified current value of the electronic component and the component is burnt out, the resistance is connected in the circuit in series, the impedance in the loop will become larger, and the current flowing through it will become smaller on the contrary.
2. Resistors play a role in dividing the voltage in the circuit
Connect multiple resistors in series and let the current flow through the resistors. Then there will be a voltage drop across the resistors. If the line resistance is not considered, the voltage will divide the resistors; if the sum of the voltage drops of the resistors is equal to the power supply voltage, one The larger voltage passes through the resistor and is divided into a smaller back-stage circuit to obtain the equivalent power supply voltage.
3. The resistance acts as a load in the circuit
When debugging the circuit or discharging, a load is required, and the power resistor can be used as a load.