1 of 3 The damage caused by electric shock depends on the current flowing throug

Question

1 of 3
The damage caused by electric shock depends
on the current flowing through the body;
1 mA can be felt and 5 mA is painful. Above
15 mA, a person loses muscle control, and 70
mA can be fatal. A person with dry skin has a
resistance from one arm to the other of about
1.4 × 105
. When skin is wet, the resistance
drops to about 4500
.
What is the minimum voltage placed across
the arms that would produce a current that
could be felt by a person with dry skin?
Answer in units of V.


2 of 3
Using the same electric potential as in Part 1,
what would be the current if the person had
wet skin?
Answer in units of mA.

3 of 3
What would be the minimum voltage that
would produce a current that could be felt
when the skin is wet?
Answer in units of V.

Explanation / Answer

V = I R a) V = .001 * 1.4 * 10E5 = 1.4 * 10E2 = 140 Volts b) I = V/R = 140 / 4500 = .031 A = 31 mA c) V = I R = .001 * 4500 = 4.5 Volts

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