What is Ohm's law?

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besure77 | Middle School Teacher | (Level 1) Senior Educator

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Ohm's Law is the relationship between power, current, voltage, and resistance. It was discovered by Georg Simon Ohm. The main idea of his discovery indicated that the amount of electric current that passes through a metal conductor is in direct proportion to the amount of voltage that passes through the conductor.

Power is measured in watts and is the amount of current times the voltage level.

Current can be compared to water flowing down a river. It is what passes through a conductor.

Voltage is the pressure that flows within the current. It is what pushes the current through the conductor.

Resistance is a way to determine how much current will flow through a conductor. If something has a high resistance it will not allow much energy to pass through the conductor.

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kjcdb8er | Teacher | (Level 1) Associate Educator

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Ohm's Law relates the electrical resistance of a conductor to the voltage across it and current passing through it.

The modern form of Ohm's law is V = IR, where V is voltage, I is current, and R is the resistance of the cunductor.

The law was named after the German physicist Georg Ohm who in 1827 made measurements of applied voltage and current through simple electrical circuits containing various lengths of wire.

The most common application of Ohm's law is to circuit elements known as resistors. However, the flow of electricity through many complicated objects or systems can be modled as if the electricity were flowing through simple circuit elements, like resistors. Thus Ohm's law finds wide application in electrical sciences.

krishna-agrawala's profile pic

krishna-agrawala | College Teacher | (Level 3) Valedictorian

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Ohm's discovered by George Ohm in 1827 is a mathematical formula that describes relationship between electromotive force (E), current (I) and resistance (R) in an electric circuit.

As per this law:

E = IR

That is, Electromotive force (in volts), is equal to current (in amperes) multiplied by resistance (in ohms).

This law is applicable only to direct current (DC) circuits. However it canĀ  also be applied to AC circuits by replacing resistance bu impedance (Z).

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burnham | eNotes Newbie

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Ohm's lawState : That the current flowing in the circuit is directly proportional to the apply voltage and Inversely proportional to the resistance of the circuit

najiah's profile pic

najiah | Student, Grade 10 | eNotes Newbie

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THE CURRENT FLOWING THOUGH A CONDUCTOR IS DIRECTLY PROPORTIONAL TO THE POTENTIAL DIFFERENCE APPLIED ACROSS ITS ENDS PROVIDED ITS TEMPERATURE IS CONSTANT.

V=I R

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