At 100,000 Ω, how much current flows through your body if you touch the terminals of a 12 V battery? If your skin is wet, so that your resistance is only 1000 Ω, how much current would you receive from the same battery? Ans.(1.2 𝐱 10⁻⁴ A, 1.2 𝐱 10⁻² A)



Data Given:


Resistance 1 = R₁ = 100,000 Ω = 10⁵ Ω

Voltage = V = 12 V

Resistance 2 = R₂ = 1000 Ω = 10³ Ω



To Find:


(1) Current received by the body through resistance R₁ = I₁ = ? 

(2) Current received by the body through resistance R₂ = I₂ = ? 


Solution:


According to Ohm's law


V = IR

or

I =`\frac{V}{R}` ----------(1)


(2) Current received by the body through resistance R₂ = I₂ = ? 


for Resistance R₁ the equation (1) will become

I₁ = `\frac{V}{R₁}`

I₁ = `\frac{12 V}{10⁵ Ω}`

I₁ = 12 ｘ10⁻⁵ A

or

I₁ = 1.2 ｘ10⁻⁴ A

(2) Current received by the body through resistance R₂ = I₂ = ? 

for Resistance R₂ the equation (1) will become

I₂ = `\frac{V}{R₂}`

I₂ = `\frac{12 V}{10³ Ω}`

I₂ = 12 ｘ10⁻³ A

or

I₂ = 1.2 ｘ10⁻² A


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