Unformatted text preview: their resistance would not be the same. So we like to talk about a quantity that is specific to the material only: This is where resistivity comes in. Resistivity is related to the resistance like so: , where is the resistivity. A common type of resistor is a normal, incandescent light bulb. What happens to a light bulb when current passes through it? It lights up and gives off heat. Compare this to the action of capacitors: capacitors store energy, while resistors give off energy. All resistors give off energy when there is current flowing through them, but some give off more than others. So, we are interested in how fast the resistor is dissipating energy, or the rate. Remember this concept from PHY2054? This is power = energy/time. The amount of power that a resistor gives off is: Power from a resistor (the three forms are equivalent and found by combining any one with Ohm’s Law)....
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 Spring '08
 Avery
 Physics, Charge, Current, Electric charge, Incandescent light bulb, Electrical resistance

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