“Ohm’s law”的概念、定义、翻译、参考文献-科学参考

Ohm’s law

Physics

The ratio of the potential difference between the ends of a conductor to the current flowing through it is constant. This constant is the resistance of the conductor, i.e. V=IR, where V is the potential difference in volts, I is the current in amperes, and R is the resistance in ohms. The law was discovered in 1827 by Georg Ohm. Most materials do not obey this simple linear law; those that do are said to be ohmic but remain so only if physical conditions, such as temperature, remain constant. Metals are the most accurately ohmic conductors.

Electronics and Electrical Engineering

The electric current, I, flowing in a conductor or resistor is linearly proportional to the applied potential difference, V, across it. From the definition of resistance, R, Ohm’s law can be written:
$V = I R$
Any electrical component, circuit, or device that maintains such a linear relationship between current and voltage can be described as ohmic.
The form of Ohm’s law at a particular point is given by
$J = σ E$
which relates the current density J at a point to the electric field E at that point and the conductivity σ of the material.

Geology and Earth Sciences

The ratio of the voltage (V) applied to a conductor and the electric current (I) caused to flow through it at constant temperature is constant, and is the electrical resistance (R) of the conductor, such that V/I = R. At high current densities the law may break down for some materials.

单词	Ohm’s law
释义	Ohm’s law Physics The ratio of the potential difference between the ends of a conductor to the current flowing through it is constant. This constant is the resistance of the conductor, i.e. V=IR, where V is the potential difference in volts, I is the current in amperes, and R is the resistance in ohms. The law was discovered in 1827 by Georg Ohm. Most materials do not obey this simple linear law; those that do are said to be ohmic but remain so only if physical conditions, such as temperature, remain constant. Metals are the most accurately ohmic conductors. Electronics and Electrical Engineering The electric current, I, flowing in a conductor or resistor is linearly proportional to the applied potential difference, V, across it. From the definition of resistance, R, Ohm’s law can be written: $V = I R$ Any electrical component, circuit, or device that maintains such a linear relationship between current and voltage can be described as ohmic. The form of Ohm’s law at a particular point is given by $J = σ E$ which relates the current density J at a point to the electric field E at that point and the conductivity σ of the material. Geology and Earth Sciences The ratio of the voltage (V) applied to a conductor and the electric current (I) caused to flow through it at constant temperature is constant, and is the electrical resistance (R) of the conductor, such that V/I = R. At high current densities the law may break down for some materials.
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