AC LEC 14-09

# AC LEC 14-09 - Lecture 14 Electrical Properties Ohms Law...

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Lecture 14 – Electrical Properties Ohm’s Law Conductors, Insulators, and Semiconductors Conductivity in Metals mean free path temperature/defects Superconductivity

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Valence Electrons in Metals Charge Cloud of electrons Individual Free electrons No Potential Net electron flux = 0 Applied Potential Net electron flux ≠ 0 Drift Velocity ∞ Field
Ohm’s Law V = i R V = volts (V) i = current (A = C/s) R = resistance ( ) Ohm’s Law Resistivity R = ρ ( l /A) Units: .m Conductivity σ = 1/ ρ

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What happens to the resistance when the length of the wire is cut in half? The resistance is two times greater OR The resistance is two times smaller OR The resistance stays the same OR I don’t know
What happens to the resistance when the diameter of the wire is cut in half? The resistance is two times greater OR The resistance is two time smaller OR The resistance stays the same OR The resistance is proportional to the cross sectional area of the wire

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Is the resistance, R, a materials property?
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AC LEC 14-09 - Lecture 14 Electrical Properties Ohms Law...

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