The average bulk resistivity of the human body (apart from surface resistance of the skin) is about 5.0 Ω⋅mΩ⋅m. The conducting path between the hands can be represented approximately as a cylinder 1.70 mm long and 0.110 mm in diameter. The skin resistance can be made negligible by soaking the hands in salt water. Part A What is the resistance between the hands if the skin resistance is negligible? Part B What potential difference between the hands is needed for a lethal shock current of 100 mA ? (Note that your result shows that small potential differences produce dangerous currents when the skin is damp.) Part C With the current in part (b), what power is dissipated in the body?

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.