Unformatted text preview: constant over a wide range of voltages. • The rela:onship between current and voltage is linear. • The slope is related to the resistance. Ohm’s Law • Non ohmic materials are those whose resistance changes with voltage or current. • The current voltage rela:onship is nonlinear. • A diode is a common example of a non ohmic device. Resis:vity • The resistance of an ohmic conductor is propor:onal to its length, L, and inversely propor:onal to its cross sec:onal area, A. – ρ is the constant of propor:onality and is called the resis1vity of the material. Temperature Varia:on of Resis:vity • For most metals, resis:vity increases...
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 Winter '14
 Current, Resistance

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