Question

Chapter 17 Homework Quiz Summer 2011 k,-8.99 x 10, N ㎡で Co-8.85 x 10-12 CN㎡ e -1.60x 101" C 1kWh-3.50 x 106 J Chapter 17 A0 R=a R=R11 +α(7-7, 1. A 2.00-V potential difference is maintained across a 12.0-2 resistor for a period of 2.00 s. What total charge passes through the wire in this time interval? A person notices a mild shock if the current along a path through the thumb and index finger exceeds 81 μ. Compare the maximum possible voltage without shock across the thumb and index finger with a dry-skin resistance of 3.9 x 105 Ω and a wet-skin resistance of 1900 Ω. 2.
I need help solving #1 and #2 so I will know how to do my quiz tomorrow correctly. Thank you in advance!

Answer 1

According to ohm's law V = IR { V: voltage I: current R: Resistance I = V/R = 2.00 V/12.0 ohm I = 0.1667 A Now charge (phi) therefore I = delta Q/delta T charge = current times period = 0.1667 times 2 charge = 0.33 coulomb current I = 814 A = 81 times 10^-6 A dry skin Resistance R_1 = 5.9 times 10^5 ohm v_1 = I R_1 v_1 = 81 times 10^-6 times 3.9 times 10^5 v_1 = 31.59 v dry skin wet skin R_2 = 1900 ohm V_2 = I R_2 = 81 times 10^-6 times 1900 implies V_2 = 0.154 V wet skin voltage Range = 0.15 V - 31.60 V

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