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Unformatted text preview: So why is it that some people in their homes just get a little zap, but others are fatally shocked? • Current depends on the voltage (120V from North American outlets) and the resistance of the conductor. o Different peoples’ bodies have different resistances, though for the most part an average person is a pretty good conductor. o It also depend on the condition of the person… is their skin dry or did they just get out of the tub? Completely Dry Skin ! 500 000 Ω Salt Water Soaked Body ! 100 Ω Example : What would the effect be on a person if they stuck their finger into a regular wall outlet under the following conditions… (don’t try this at home, folks!) a) with completely dry skin? I = V/ R = (120V) / (500 000 Ω ) = 2.4 x 10-4 A You probably wouldn’t even be able to feel this… b) after sitting in a bathtub filled with salt water? I = V/ R = (120V) / (100 Ω ) = 1.2 A Youch! If this lasts more than a second, that person’s probably dead....
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This note was uploaded on 02/29/2012 for the course PHYS 227 taught by Professor Rabe during the Fall '08 term at Rutgers.
- Fall '08