Question

What is Ohm's law?
Answer fast.

Answer 1

Answer:

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Ohm's law

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship

{\displaystyle I={\frac {V}{R}},} I={\frac {V}{R}},

where I is the current through the conductor in units of amperes, V is the voltage measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms. More specifically, Ohm's law states that the R in this relation is constant, independent of the current. 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.

The law was named after the German physicist Georg Ohm, who, in a treatise published in 1827, described measurements of applied voltage and current through simple electrical circuits containing various lengths of wire. Ohm explained his experimental results by a slightly more complex equation than the modern form above (see History).

In physics, the term Ohm's law is also used to refer to various generalizations of the law; for example the vector form of the law used in electromagnetics and material science:

{\displaystyle \mathbf {J} =\sigma \mathbf {E} ,} \mathbf {J} =\sigma \mathbf {E} ,

where J is the current density at a given location in a resistive material, E is the electric field at that location, and σ (sigma) is a material-dependent parameter called the conductivity. This reformulation of Ohm's law is due to Gustav Kirchhoff.

Answer 2

$\huge \sf \red{Ohm's \: law.}$

This law was given by a German Physicist Georg Simon Ohm (1787-1854) in the year 1827. It gives a relationship between current I, flowing in a metallic wire and potential difference V, across its terminals.

According to this law, the electric current flowing through a conductor is directly proportional to the potential difference applied across its ends, providing the physical conditions (such as temperature); remain unchanged.

If V is the potential difference applied across the ends of a conductor through which current I flows, then according to Ohm's law,

V=IR[at constant temperature]

where, R is the constant of proportionally called resistance of the conductor at given temperature.

From the above formula, it is clear that current is inversely proportional to resistance. If resistance is doubled,then current gets halved and if resistance is halved,then current gets doubled.