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January 25, 2015

January 25, 2015

Posted by **Rohan Khan** on Friday, June 10, 2011 at 1:31am.

(a) If the internal resistance of the power supply is 2000Ù, what is the current through the person’s body?

(b) What is the power dissipated in his body?

(c) If the power supply is to be made safe by increasing its internal resistance, what should the internal resistance be for the maximum current in the above situation to be 1.00mA or less?

- electricity -
**drwls**, Friday, June 10, 2011 at 2:21am(a) I = V/R

where R = Rb + Ri

= (10 + 2)*10^3 = 12,000 ohms

Rb = body resistance

Ri = power supply internal resistance

(b) I^2*Rb

(c) Require that V/(Rb + Ri) < 10^-3 A

Solve for Ri

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