Question

A person notices a mild shock if the current along a path through the thumb and index finger exceeds 77 μA. Compare the maximum possible voltage without shock across the thumb and index finger with a dry-skin resistance of 4.4 ✕ 105 Ω and a wet-skin resistance of 1,750 Ω.

Answer 1

Answer:

Maximum possible voltage without shock across the thumb and index finger with a dry-skin = 33.88 V

Maximum possible voltage without shock across the thumb and index finger with a wet-skin = 0.135 V

Explanation:

From Ohm's law

V = IR

For the maximum possible voltage without shock for dry skin, the

R = 4.4 × 10⁵ Ω

I ≤ 77 μA

I ≤ 77 × 10⁻⁶ A

V ≤ 4.4 × 10⁵ × 77 × 10⁻⁶ = 33.88 V

For the maximum possible voltage without shock for dry skin, the

R = 1750 Ω

I ≤ 77 μA

I ≤ 77 × 10⁻⁶ A

V ≤ 1750 × 77 × 10⁻⁶ = 0.13475 V