I understand the problem and everything. I just dont understand the first part w

Question

I understand the problem and everything. I just dont understand the first part where it is (1/1)+(1/12.5*10^-6)=12.4998*10^-6. How is the answer the same value???

The general explanation of how a car can protect you from a lightning strike is simple, but the specific numbers will vary based on the car, the person inside the car, and the lightning strike. The tires play no role in protecting the passenger! Instead, the car and passenger can be considered parallel resistors. If the resistance of the car is 12.5 ??, the resistance of the passenger is 1.00 ?, and the current of the lightning strike is 10.0 kA, how much current passes through the passenger?

10.0kA 12.5 1.00 Rs R1 R2 1.00 12.5×10-6 12.4998× 10% Vs= Itot R,-| 10.0 × 103A 12.4998 × 10-6-12.4998x 10-2 V 12.4998× 10-2 v 1.00 Vs 124.998 10-s A = 125 mA -

Explanation / Answer

in the first part

in parallel combination

1/Rs = (1/R1)+(1/R2)

1/Rs = (1/1)+(1/(12.5*10^-6)) = 1+80000 = 80001

Rs = 1/80001 = 12.4998*10^-6 Ohm

since in parallel combination we get net resistance is decreases when compared with individual resistances

and also R1>>R2,then Rs is alomst all equal to smallest value in the circuit i.e R2

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