Current Electricity -- current flowing through hand 1. The problem statement, all variables and given/known data i)For a layer dry skin 1mm thick, determine the resistance of a 1 cm^2 area of skin. Resistivity of dry skin : 3 x 10^4 ohms m [3.0 x 10^5 ohms ] ii)A person, who is well-earthed, accidentally grabs a wire of diameter 0.4 cm at a potential of 50V. His hand makes contact with the whole circumference of the wire over a distance of 9cm. The average thickness of skin of his hand is 1mm. Estimate the current flowing through him. [1.89 mA ] 2. Relevant equations Resistance = resistivity(length)/area V = IR 3. The attempt at a solution For i) , I managed to solve it. Using the equation directly. For ii), I couldn't get the answer. First, I calculate the surface area of the cylinder ( wire ) where it is in contact with the wire. Surface area = pi . diameter . length = pi . (0.4 x 10^-2) . (9 x 10^-2) = 0.0011309 m^2 Then I multiply this surface area with the resistance of dry hand obtain in i) Total resistance = surface area x resistance of dry skin 1 mm thick, area of 1m^2 = 0.0011309 x 3.0 x 10^5 Next, I used V = IR. Sub in total resistance and P.D of 50 V The answer I got was 0.147 A. Totally off. Thanks for the time !