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Factors affecting resistance (R) of a wire
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Factors affecting resistance (R) of a wire Introduction Resistance is the force, which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit. The unit of resistance is the ohm and the symbol for ohms in electric circuits is the Greek letter omega, ?. 1 ohm is the amount of resistance that limits the passage of current to one ampere when a voltage of one volt is applied to it. Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire. These collisions slow down the flow of electrons causing resistance. Resistance is a measure of how hard it is to move the electrons through the wire. The basic law of current flow is ohm's law. Ohm's law was named after its discoverer George Ohm (1787-1854) a German physicist who researched electrical current...
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