state ohm's law define resistance and unit
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The quotient V/I for a given piece of material is called its resistance, R, measured in units named ohms. The resistance of materials for which Ohm's law is valid does not change over enormous ranges of voltage and current. Ohm's law may be expressed mathematically as V/I = R.
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Stopping and preventing electricity is called resistance.
The SI unit of resistance is Ohm.
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