lec06 - Battery and Electric Current A battery is a device...

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A battery is a device that supplies and maintains an electric potential difference by means of chemical reactions. It consists of two solid conductors (electrodes) made of different material immersed in an active solution (electrolyte). The potential difference generated between the electrodes is caused by the difference of their solubility in the electrolyte. The potential difference between the battery’s electrodes, when no current is drawn, is called the emf (electromotive force) of the battery. When a potential difference V=V A -V B is maintained (e.g. by a battery) across a conducting body (e.g. a wire), an electric field is established in the body that causes free electrons to move in the direction opposite to the electric field, (i.e. from low potential to high potential). Electric current ( I ) is defined as the net amount of positive charge passing through an imaginary plane perpendicular to the flow direction per unit time. t
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This note was uploaded on 12/06/2011 for the course PHYSICS 111&112 taught by Professor Unknown during the Spring '11 term at Ohio State.

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lec06 - Battery and Electric Current A battery is a device...

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