OHM'S LAW

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OHM’S LAW

Ohm’s Law states that the current flowing through a metallic conductor is directly proportional to the potential difference  across its ends at constant temperature and pressure.

Ohm’s law only applied to metallic conductor at constant temperature and pressure. It does not apply to some substances such as transistor, acids and semiconductors.

Potential difference(in Volts) ɤ  current (in Ampere)

Mathematically,

Ohm’s law states that

Potential difference V = current I  x  Constant

The constant represent the nature of the conductor and is called the Resistance of the conductor.

Therefore,

Ohm’s Law states that

Potential difference  V =  Current I  x  Resistance

Resistance can therefore be defined as the ratio of the potential difference V in a circuit to the current I flowing through it.

The unit of Resistance R is ohm (Ω)

Other units are

,

One ohm is the resistance of a wire when a potential difference of one volt is applied across its ends, a current of one Ampere flow through it

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