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How does the length of a wire affect the resistance?
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How does the length of a wire affect the resistance? Planning Background Knowledge Resistance Resistance is the opposition of electron flow in a circuit and is based on the physical size of the conductors. Since current is the movement of free electrons in a circuit then the number of atoms in a wire make a big difference as to how many electrons can flow at any given time. The bigger the diameter a wire is, the more atoms there are in the wire, so the more free electrons. The smaller the diameter of wire the fewer the number of atoms so the fewer the number of free electrons. The factors that affect the resistance of a wire are: * As the length increases the resistance increases * As cross- sectional area increases, resistance decreases * It depends on the material of the wire, example: nichrome * As the temperature increases, the resistance of a wire increases. Theory: George Ohm discovered...
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