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In: Physics

The resistance of the body varies from approximately 500 kΩ (when it is very dry) to...

The resistance of the body varies from approximately 500 kΩ (when it is very dry) to about 1.00kΩ (when it is wet). The maximum safe current is about 5.00 mA. At 10.0mA or above, muscle contractions can occur that may be fatal.

a)What is the largest potential difference that a person can safely touch if his body is wet?

b)Is this result within the range of common household voltages?

Solutions

Expert Solution

This says when wet, resistance is about 1000Ω. If we accept that 5.00 mA is the maximum safe current, then the answer to part (a) comes from Ohm's law:

V = IR = (5 * 10-3 A)(1000 Ω) = 5 V

Part (b), this is definitely within the range of household voltages; wall voltage in the US is 110 V.

genius_generous answered 2 years ago
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