## Physics - Electrical Resistance

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The resistance of a metallic conductor varies with its temperature. Resistance is defined as the ratio of the potential difference across it to the flowing through it. The unit of resistance is the . Resistance may be measured with an . Ohm's Law states that the current flowing through certain conductors is directly proportional to the difference across the conductor.
When two or more resistors are connected in series, their combined resistance is equal to the of their individual resistances.
The resistance of a conductor depends upon its , cross-sectional area, the material from which it is made and its temperature. The resistance of most metals with increasing temperature while the resistance of most non-metals with temperature.
A is a semiconductor device whose resistance decreases rapidly with change in temperature.
is a property of all resistors. The of a conductor is proportional to its resistivity and its length, while resistance is inversely proportional to its cross-sectional .
Resistance may also be measured using a bridge.
A semiconductor whose resistance changes with the amount of light falling on it is called a light resistor.