PHYS 102 Chapter Notes - Chapter 18: Proton Conductor, Electric Current, Electrical Resistance And Conductance
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PHYS 102 Full Course Notes
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An electric battery serves as a source of nearly constant potential difference by transforming chemical energy into electric energy. A simple battery consists of two electrodes made of different metals immersed in a solution or paste known as an electrolyte. Electric current, , refers to the rate of flow of electric charge and is measured in amperes (a): 1. A equals a flow of 1 c/s past a given point. The direction of conventional current is that of positive charge flow. In a wire, it is actually negatively charged electrons that move, so they flow in a direction opposite to the conventional current. A positive flow in one direction is almost always equivalent to a negative charge flow in the opposite direction. Positive conventional current always flows from a high potential to a low potential. The resistance of a device is defined by the relation: Where is the current in the device when a potential difference is applied across it.
