circuits2 - Batteries Battery produces electricity by...

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1 Electric Circuits 2 MF Batteries DC Direct Current Circuits EMF, Batteries, DC Direct Current Circuits Batteries Battery produces electricity by transforming chemical energy into electrical energy made of dissimilar metal electrodes , immersed in an electrolyte parts of the electrodes outside of the electrolyte are called the terminals , where the wires are connected acid of the electrolyte starts to dissolve one electrode (-), leaving behind electrons as the positive ions enter e solution the solution these attract electrons from the opposite electrode, making it + opposite charges on the 2 electrodes yields a potential difference Lemon Battery Typical Lead & Sulphuric Acid Battery •Chemical Equilibrium is reached when =2V V = 2V •use of battery upsets equilibrium ) more electrons flow to compensate
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2 Battery as Charge Escalator a battery is often called an emf (for electromotive force ) an emf device (battery, generator, solar cells, fuel cells, etc.) produces a steady flow of charge in a circuit the battery acts like a charge escalator/pump: it does work on charges in order to maintain a specified voltage difference (the terminal voltage ) between its two rminals terminals the electric field in the external wire is directed from + to –term ina l inside the emf, charges are forced to move in the opposite direction due to the work done on them by the battery the battery “lifts” the charges from low to high potential Battery (seen as charge escalator or pump) The potential difference between the terminals of a battery, often called the terminal voltage , is the battery’s emf y V bat = = W chem q ____ Battery as charge escalator Battery is a Source of emf ε note that this is an unfortunate name, but it is istorical historical it is NOT a force, but a potential difference that exists between the terminals of a battery creates an electric field, which results in a force
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This note was uploaded on 03/22/2011 for the course MAC AEPH114 taught by Professor Knutt during the Spring '11 term at McGill.

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circuits2 - Batteries Battery produces electricity by...

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