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The milliohm is a multiple of the unit ohm (Ω) for electrical resistance. The International System of Units (SI) defines the prefix milli (m) as a factor of one thousandth or 10-3 or 0.001. Per this definition, one milliohm is 0.001 ohms. The milliohm is represented by the symbol mΩ.

The siemens (S) is the SI derived unit of electric conductance and admittance, also known as the mho (ohm spelled backwards, symbol is ℧). It is the reciprocal of resistance in ohms (Ω).

resistor 消耗的功率可以通过其电阻以及所涉及的电压 或电流 来计算。该公式是欧姆定律和焦耳定律的组合，其中：P = V ∙ I = V2⁄R = I2 ∙ R. 哪里：

P是幂

R是电阻

是电阻两端的电压

是通过电阻器的电流

A linear resistor has a constant resistance value over all applied voltages or currents. Many practical resistors are linear over a useful range of currents. Non-linear resistors have a value that may vary depending on the applied voltage (or current). Where alternating current is applied to the circuit (or where the resistance value is a function of time), the relation above is true at any instant but calculation of average power over an interval of time requires integration of instantaneous power over that interval.

由于欧姆属于相关的单位系统，当这些量中的每一个都有其对应的SI单位（P代表瓦特，R代表欧姆，V代表伏特，I代表安培时，这个公式在数值上仍然有效当这些单位被使用时（并被认为被取消或省略）。

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转换自:

按字母顺序

反向字母

转换成:

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反向字母

价值:

圆形（小数位）:

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“Ohm.” Wikipedia, Wikimedia Foundation, 4 June. 2020, en.wikipedia.org/wiki/Ohm.