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①导体对电流通过的阻碍作用。导体的电阻随长度、截面大小、温度和导体成分的不同而改变。电阻的单位是欧姆。②利用这种阻碍作用做成的元件。

1. 指器件或材料对电流的阻碍作用。在直流电路中，电阻值等于电压降除以所通过的电流。导线的电阻取决于它的长度、截面积和材料的性质。金属的电阻最小，绝缘体的电阻最大。电阻的基本单位是欧姆，简称欧。

2. 利用器材或材料对电流的阻碍作用制成的电子元件。

• Copper has less resistance to electricity than lead.

  铜比铅的电阻要小.

• The electric resistance is measured in ohm.

  电阻的测量单位是欧姆。

• When resistance in the circuit exceeds 230 ohms, the reading is not completely dependable.

  网路电阻超过230欧姆时，读数就完全不准了。

• We can see that the massive vein is revealed by resistivity.

  可以看出,致密的矿脉可用电阻率法来发现.

• Resistance thermometer bridges may be excited from either a - c or d - c sources.

  电阻温度计 电桥 的供电可以是交流电源,也可以是直流电源.

• The resistance is halved if the cross - sectional area is doubled.

  如果截面积增加一倍,则电阻减少一半.

• We shall take the typical emitter - to - base resistance as about 250 ohms.

  我们取发射极基极电阻的典型值为250欧姆左右.

• How resistance is affected by temperature is yet to be found out.

  电阻是怎样受温度的影响已经弄清楚了.

• Many plastics have high surface resistance and low electrical conductivity.

  很多塑料具有高的表面电阻和低的导电性能.

• The light bulb has a resistance of 120 ohms.

  灯泡有120欧姆的电阻.

• The resistivity is then constant and Ohm's law is obeyed.

  因此电阻率也是常数,并遵循欧姆定律.

• This average reading removes some of the effect of contact resistance.

  平均读数法去除了接触电阻的某些影响.

• Current , resistance and voltage can be measured by the universal meter.

  万用表可用来测量电流 、 电阻和电压.

• The simplest version of the thermocouple gage consists of a resistance wire.

  最简单的热电偶真空计是由电阻丝组成.

• To melt the charge, radio frequency ( induction heating ) or resistance heating have been used.

  为了熔化进料, 可用射频 ( 感应加热 ) 或电阻加热法.