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13d
电阻为什么都是4.7kΩ、5.1kΩ,而不是整数5kΩ?
电阻在实际生产制造中,不可能完全精确,总是会有一些误差。比如一个100Ω的电阻,如果标注误差是1%,那么这个电阻在99Ω~101Ω之间就都是允许的。因此,在上个世纪,美国电子工业协会就定义了一个标准电阻值系统。
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