| RESISTANCE - THE PHYSICAL PROPERTIES: LENGTH | ||
The length of a conductor is also a factor that determines the resistance of a conductor. If the length is increased, the amount of energy given up increases. As free electrons move from atom to atom, some energy is given off as heat. The longer a conductor is, the more energy lost. The additional energy loss subtracts from the energy being transferred through the conductor, resulting in a decrease in current flow for a given applied voltage. A decrease in current flow indicates an increase in resistance, since the voltage was held constant. Hence, if the length of a conductor increases, resistance increases. The resistance of a conductor is directly proportional to its length. |
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