Do you know the blological connection of resistance and current to the human body?
Text Solution
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When the skin is dry, resistance of humna body is `~~10^(5) ohm` , and when the skin is wet, the body resistance is `~~ 1500 ohm`. Our supply voltage is 220 V. Therefore, when the skin is dry, current through the body, `I=V/R = 220/10^(5) A= 2.2 mA` and current through the wet body, `I= V/R = 220/1500 A = 147.0 mA`. As is known, a current of 100 mA to 3 A through the human body is fatal , current of 20 mA to 100 mA causes paralysis , current of 10 mA to 20 mA causes muscular disorder and a current of 2 mA through the body causes tingling. Hence touching a 220 V live wire, especially when the body is wet, may have serious consequneces.
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