Comprehensive analysis of resistance, definition, types, functions, and measurement methods

What is a resistor? This article covers everything comprehensively

In daily life, we often come into contact with various electronic components, and one common component is a resistor. However, despite using it every day, our true understanding of resistance may not be profound. This article will comprehensively analyze resistance, including its definition, types, functions, and measurement methods

1、 Definition and Basic Properties of Resistance

Resistance, as the name suggests, is the ability to prevent the flow of electrical current. It represents the degree of obstruction of current by voltage, usually measured in ohms (Ω). The basic property of resistance is that it has a hindering effect on current, and as the current increases, the resistance also increases; On the contrary, when the current decreases, the resistance will also decrease. In addition, resistors also have nonlinear characteristics, that is, the resistance value is not linearly related to the voltage or current at both ends

2、 Types of resistors

According to the different resistance values and materials, resistors can be divided into various types:

1. According to the resistance value: adjustable resistors (such as potentiometers), fixed resistors (such as carbon film resistors), etc. 2. According to materials: metal conductor resistance, semiconductor resistance, insulator resistance, etc. 3. According to usage: operational amplifier resistors, power supply resistors, precision resistors, etc

3、 The function of resistance

Resistors play an important role in electronic devices. Mainly reflected in the following aspects:

1. By changing the resistance value in the circuit, the current and voltage of the circuit can be controlled. 2. Prevent short circuits in the circuit and ensure the stable operation of the equipment. 3. Use series or parallel resistors to achieve circuit voltage division or current limiting functions. 4. In thermistors and photoresistors, the special resistance temperature or photosensitive characteristics are utilized to achieve functions such as temperature measurement or light control