4. The electrical resistance of human body in about 50 ko on average. If a person inadvertently touches the terminals of a 20 kV power supply, which has an internal resistance of 2 kV: a) What would be the current passing through him? Given that a 0.1 mA (milliamp) current can kill a person, does he survive? b) The electrical resistance of a wet or damaged skin can be as low as 1 k. What should the internal resistance of such power supply be so that it considered safe for human?

4. The electrical resistance of human body in about 50 ko on average. If a person inadvertently touches the terminals of a 20 kV power supply, which has an internal resistance of 2 kV: a) What would be the current passing through him? Given that a 0.1 mA (milliamp) current can kill a person, does he survive? b) The electrical resistance of a wet or damaged skin can be as low as 1 k. What should the internal resistance of such power supply be so that it considered safe for human?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Ohm's law

Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.

Path of Least Resistance

In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.

Question

4. The electrical resistance of human body in about 50 ko on average. If a person
inadvertently touches the terminals of a 20 kV power supply, which has an internal
resistance of 2 kV:
a) What would be the current passing through him? Given that a 0.1 mA (milliamp)
current can kill a person, does he survive?
b) The electrical resistance of a wet or damaged skin can be as low as1 ko. What
should the internal resistance of such power supply be so that it considered safe
for human?

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