Resistance is a physical quantity that describes the conductivity of a conductor, represented by R. Resistance is defined by the ratio of the voltage U across a conductor to the current I passing through it. Therefore, when the voltage across the conductor is constant, the greater the resistance, the smaller the current passing; on the contrary, the smaller the resistance, the greater the current passing. Therefore, the size of the resistance can be used to measure the strength of the conductor's resistance to the current, that is, the quality of the electrical conductivity. The magnitude of resistance is related to factors such as the material, shape, volume, and surrounding environment of the conductor.
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