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电阻表示导体对电流的阻碍作用,它由导体本身的因素决定.导体的长度、材料和横截面积决定了导体电阻的大小,同时,温度对电阻也有一定的影响.一般情况下,非金属电阻随着温度的升高而减小,金属电阻随着温度的升高而增大.这里的温度是指大范围的变化,所以一般情况下因为温度变化范围较小,我们并没有考虑温度对导体电阻的影响,但是对于灯泡这一类不发光与发光时温度差距就很大的用电器,我们在解答具
Resistance represents the impediment to the current by the conductor, which is determined by the factor of the conductor itself. The length, material and cross-sectional area of the conductor determine the size of the conductor’s resistance and, at the same time, the temperature has a certain influence on the resistance. In general, As the temperature decreases, the metal resistance increases with increasing temperature, where the temperature refers to a wide range of changes, so in general because of the small temperature range, we do not consider the temperature of the conductor The impact of resistance, but this type of bulb does not emit light and luminous temperature difference is very large electrical appliances, we have to answer