The damage caused by electricshock depends on the current flowing through the bo

Question

The damage caused by electricshock depends on the current flowing through the body; 1 mA can befelt and 5 mA is painful. Above 15 mA, a person loses musclecontrol, and 70 mA can be fatal. A person with dry skin has aresistance from one arm to the other of about 1.1 × 105 . When skin is wet, the resistance drops to about 4600.

a) What is the minimum voltageplaced across the arms that would produce a current that could befelt by a person with dry skin? [Answer in units of V.]

b)Using the same electric potential as in Part 1, what wouldbe the current if the person had wet skin? [Answer in units ofmA.]

c)What would be the minimum voltage that would produce acurrent that could be felt when the skin is wet? [Answer in unitsof V.]

Explanation / Answer

V=1e-3*1,1e5=110(V). b). I=110/4600=24mA. c) U=1e-3*4600=4,6V

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