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Unformatted text preview: I=V/R Ohm’s Law The current through a metal conductor is proportional to the applied voltage. Resistivity A L R ρ = Conceptual Example: Stretching Changes Resistance A wire of resistance R is stretched uniformly until it is twice its original length. What happens to its resistance? Effect of Temperature )) ( 1 ( T T T+ = α ρ α – temperature coefficient of resistivity is positive for metals and negative for semiconductors. Superconductivity 1. When you stack three flashlight batteries in the same direction, you get a voltage of 3x1 ½ volts = 4 ½ volts. What voltage do you get if one of the batteries is turned to face in the opposite direction? 2. What is the difference between a bulb burning out and removing the bulb from its socket? 3. If the resistance connected to a battery is cut in half, what happens to the current through the battery?...
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 Spring '09
 BOROVITSKAYA,ELENA
 Charge, Current, 1 Ampere, Conceptual Example, electric cell, continuous conducting path, ∆Q I= ∆t

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