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# What is Ohm’s Law?

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Ohm’s Law is:

The electric current I flowing through a substance is proportional to the voltage V across its end, i.e.,

V ∝ I

or

V = RI

where the constant of proportionality R is called the resistance of the conductor. The SI unit of resistance is ohm, and is denoted by the symbol Ω. The resistance R not only depends on the material of the conductor but also on the dimensions of the conductor as below in the formula:-

1 Ω = 1 VA^{-1}

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