Time：2024-09-30 09:09 View：322
Resistance unit, let's first have a brief understanding of what is resistance. In simple terms, resistance is like a barrier in the water pipe, preventing the flow of water through. The stronger the flow, the greater the resistance; The more obstacles there are, the harder it is for water to flow through. In the same way, when the current flows through the conductor, it also encounters an obstacle, which is called resistance.
The magnitude of the resistance is expressed by the value of the resistance, the unit is Ohm (Ohm), and the symbol is Ω. 1 ohms means that when the voltage at both ends of the conductor is 1 volt, the current through the conductor is 1 amp.
In order to facilitate the representation of larger or smaller resistance values, we will also use multiple units of ohms, commonly used are:
Kilohm (kΩ) : 1 kΩ = 1000 Ω
Megohm (MΩ) : 1 MΩ = 1000 kΩ = 1000000 Ω
The size of the resistance is related to the material, length and cross-sectional area of the conductor. For example, for conductors of the same length and cross-sectional area, silver has the smallest resistance, followed by copper, and iron has a larger resistance. This means that, under the same conditions, the current flows most easily in a silver wire, while it flows most difficult in an iron wire.
Understanding resistance units and concepts is essential for us to understand circuit principles and select appropriate electronic components. In daily life, we encounter a variety of electronic devices are inseparable from resistance, such as mobile phones, computers, TV sets and so on. It is because of the resistance that we can control the size of the current and achieve various functions.
