We can solve the problem by using Ohm's law.
The resistance of the person, with dry skin, is
. In order to be felt, the current must be at least
Ohm's law gives us the relationship between current and voltage:
where
I is the current
R the resistance
V the voltage
Using the data of the problem, we find that the minimum voltage needed is
The resistance of the person, with dry skin, is
Ohm's law gives us the relationship between current and voltage:
where
I is the current
R the resistance
V the voltage
Using the data of the problem, we find that the minimum voltage needed is