What is OHM'S LAW
What is Ohm's Law?
In 1926, a German Physicist, called George Simon Ohm, discovered that for a given conductor there is relationship between the current flowing through it and the potential difference across it.
He found out that,
" The current passing through a metallic conductor at constant temperature is proportional to the potential difference between its ends. This is known as Ohms Law"
Resistance (electricity), property of any object
or substance to resist or oppose the flow of an electrical current. The quantity
of resistance in an electric circuit determines the amount of
current flowing in the circuit for any given voltage applied to the circuit,
according to Ohm's law. The unit of resistance is the ohm, the amount of
resistance that limits the passage of current to one ampere when a voltage of
one volt is applied to it. The standard abbreviation for electric resistance is
R and the symbol for ohms in electric circuits is the Greek letter omega,
Ω. For certain electrical calculations it is convenient to employ the reciprocal
of resistance, 1/R, which is termed conductance, G. The unit of
conductance is the mho, or ohm spelled backward, and the symbol is an inverted
omega, ℧.
The resistance of an object is determined by the nature of
the substance of which it is composed, known as the resistivity, the dimensions
of the object, and the temperature. Resistivity is expressed in terms of the
ohms resistance per cubic centimeter of the substance at 20° C (68° F).
the substance of which it is composed, known as the resistivity, the dimensions
of the object, and the temperature. Resistivity is expressed in terms of the
ohms resistance per cubic centimeter of the substance at 20° C (68° F).
The term resistance is also used when the flow of a
fluid or heat is impeded. The forces of friction provide the resistance to the
flow of a fluid in a pipe, and insulation provides thermal resistance that
reduces the flow of heat from a higher to a lower temperature.
fluid or heat is impeded. The forces of friction provide the resistance to the
flow of a fluid in a pipe, and insulation provides thermal resistance that
reduces the flow of heat from a higher to a lower temperature.
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