Ohm's law is an empirical relation which accurately describes the conductivity of the vast majority of electrically conductive materials over many orders of magnitude of current. However some materials do not obey Ohm's law; these are called non-ohmic.

在 電路學 裡， 欧姆定律 （英語： Ohm's law）表明：定溫下， 电导体 两端的 电壓 与通过电导体的 电流 成正比 [1]。 数学表达式 为： 因此，對於任意电导体（電路 、 電路元件 、甚至 電阻器），電阻 可定義為此 正比关系 的比例常数 [1]： 且可得到下列方程式： 不論電流、電壓為何， 電阻 定義均為電壓除以電流。 此外，任何电导体都有电阻，即使 超导体 在一般温度下也具有微小的电阻。 然而並不是每一種元件都遵守歐姆定律，此定律是經過多次實驗而推斷的法則，只有 …

2019年5月9日 · Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperatures remain constant. Mathematically, this current-voltage relationship is written as,

2021年9月19日 · Ohm’s Law Definition: Ohm’s Law states that the current through a conductor is proportional to the voltage across it and inversely proportional to its resistance. Understanding the Formula: The basic formula of Ohm’s Law, I = V/R, helps determine the current if the voltage and resistance are known.

2025年2月14日 · Ohm’s law, description of the relationship between current, voltage, and resistance. The amount of steady current through a large number of materials is directly proportional to the potential difference, or voltage, across the materials.

2022年9月7日 · Ohms law is a simple formula that makes it easy to calculate voltage, current, and resistance. You can use it to find what resistor value you need for an LED . Or to find out how much power your circuit uses.

2025年3月12日 · Ohm’s law explains the relationship between current, voltage, and resistance. It states that under constant temperature and physical conditions, the amount of electric...

2018年2月20日 · Ohm’s law formula helps to calculate voltage, current and resistance. By lumping Ohm’s law with joules law, one can easily achieve the formula for power. Let’s take a look at formulas: When current and resistance are given use V = IR to calculate voltage. Example #1: Find the voltage applied across 10 kΩ resistors when 5 mA current flows through it

Ohm's Law is a formula used to calculate the relationship between voltage, current and resistance in an electrical circuit. To students of electronics, Ohm's Law (E = IR) is as fundamentally important as Einstein's Relativity equation (E = mc²) is to physicists. E = I x R.

2019年11月5日 · Ohm’s law is the relationship between voltage, current and resistance and how they relate to each other. Ohm’s law was developed by a German physicist named Georg Ohm who undertook many experiments to develop his theory including measuring current by touching electrical circuits to see how much it hurt.