PracticaI Perspective Etectrical. Safety "Danger-High VoLtage." This commonty seen warning is mis-teading. Att forms of energy, including etectricaL energy, canbe hazardous. gut ifs not onty the vottage that harms. Thestatic etectriciry shock you receive when you watk across acarp€t and touch a doorknob is annoying but does not injure.Yet that spark is caused by a vottage hundr€ds or thousandsoftimes larger than the voltages that can cause harm.The etectricat energy that can actuatty cause injury is dueto etectricai current and how it ftows through the body. Why,then, does the sign warn of high vottage? Eecause ofthe wayeLectrical power is produced and djstributed, it is easier todetermjre voLtages than cuffents. Atso, most etectdcaLsources produce constant, specified voltages. So the signswarn about what is easy to measure. Determining whether and under what condjtjons a source can suppty potentiaLtydangerous 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.