Electric Circuits 8th Edition 47

Electric Circuits 8th Edition 47 - P racticaI erspective...

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PracticaI Perspective Etectrical. Safety "Danger-High VoLtage." This commonty seen warning is mis- teading. Att forms of energy, including etectricaL energy, can be hazardous. gut ifs not onty the vottage that harms. The static etectriciry shock you receive when you watk across a carp€t and touch a doorknob is annoying but does not injure. Yet that spark is caused by a vottage hundr€ds or thousands oftimes larger than the voltages that can cause harm. The etectricat energy that can actuatty cause injury is due to etectricai current and how it ftows through the body. Why, then, does the sign warn of high vottage? Eecause ofthe way eLectrical power is produced and djstributed, it is easier to determjre voLtages than cuffents. Atso, most etectdcaL sources produce constant, specified voltages. So the signs warn about what is easy to measure. Determining whether and under what condjtjons a source can suppty potentiaLty dangerous currents is more difficutt,
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This note was uploaded on 07/05/2010 for the course EE 100 taught by Professor Boser during the Spring '07 term at Berkeley.

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