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Conductors and Insulators A substance which offers comparatively less opposition to the flow of current is known as conductors and substances which offer larger opposition are insulators. Electric Potential and Potential Difference The electric potential at a point is defined as work done in bringing a unit positive charge from infinity to that point. The potential difference between two points is defined as the difference in electric potentials at the two given points. Models of Electric Current Electric Current(I) Flow of electric charges is called electric current, i.e, I = Q / t Electron sea model Electric current in a solid conductor is due to drift of a ‘sea’ of free electrons, which are free to jump onto any neighbouring atom. Drift velocity of Electron Average velocity which an electron attains inside a metallic conductor due to the application of an electric field due to the potential difference. Electric Circuit Electric circuit and circuit diagram • A closed-loop path which a current takes is called an electric circuit. • Representation of an electric circuit through symbols is called a circuit diagram. • Resistance and Ohm’s Law Ohm’s law The current flowing through an ohmic conductor is directly proportional to the applied potential difference between the two ends of the conductor. Resistance Resistance is a measure of the opposition offered to the current flow in an electric circuit. Factors affecting Resistance & How they affect Resistance is: • Directly proportional to the length of the conductor. • Directly proportional to nature of the conductor. • Directly proportional to the temperature of the conductor. • Inversely proportional to the cross-sectional area of the conductor.

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