How the resistor works

When a current passes through an electronic component, it creates resistance. A resistor is a passive electronic component whose main function is to limit or regulate the flow of current. In a circuit, resistors can be used to lower the current and lower the voltage. It is made of copper wire wrapped around a ceramic rod and coated with insulating paint. When the current passes through the resistor, it generates heat and dissipates it. In this process, the resistor will block the flow of current, thus reducing the voltage.

According to Ohm’s law, the resistance value of a resistor is determined by its length, cross-sectional area and material. When a voltage is applied to both ends, the current passing through it is proportional to the voltage applied to it. This ratio is often referred to as Ohm’s law. Therefore, we can change the resistance value by changing the length, cross-sectional area and material of the resistor.

In practical applications, we can use different types of resistors to meet different needs. For example, variable resistors can be used to adjust volume or brightness. Thermistors can be used to measure temperature. A photoresistor can be used to measure the intensity of light.

In short, understanding how a resistor works is crucial to understanding basic electronic components. Hopefully this article will help you understand them better.