一、电阻的概念导体容易导电,但对电流有阻碍作用,且不同导体对电流的阻碍作用一般不同.物理学中把导体对电流的阻碍作用叫做电阻.电阻通常用“R”表示. 二、电阻的单位电阻的国际单位是欧姆,简称“欧”.符号是“Ω”.若导体两端的电压是1伏,通过导体中的 First, the concept of resistance The conductor is easy to conduct, but has a hindering effect on the current, and different conductors on the current blocking effect is generally different. In physics to the conductor of the current blocking effect is called resistance. Resistance is usually represented by “R”. The international unit of resistance unit resistance is ohms, abbreviated as “Euro”. The symbol is “Ω”. If the voltage across the conductor is 1 volt, it is passed through the conductor.