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Define ohm\'s law ?? V=IR |
| Answer» According to Ohm’s law, the current (I) flowing through a conductor is directly proportional to the potential difference (V) across its ends, provided its physical conditions remain the same.\xa0V µ IV/I = ConstantV/I = RV = IRwhere R is a constant of proportionality called resistance of the conductor.Resistance is the property of a conductor to resist the flow of charges through it. The S.I. unit of resistance is ohm (Ω).From R = V/I, 1 ohm = 1 volt/ampereThe property of the conduct due to which it opposes the flow of current through it is called as resistance of conductor.The current through a resistor is inversely proportional to its resistance. If the resistance is doubled the current gets halved. A component used to regulate current without changing the voltage source is called variable resistance. In an electric circuit, a device called rheostat is often used to change the resistance in the circuit. A conductor having some appreciable resistance is called a resistor. A component of identical size that offers a higher resistance is a poor conductor. An insulator of the same size offers even higher resistance. | |