You may want to review (Pages 850 - 851) . Part A John is changing a lightbulb i

Question

You may want to review (Pages 850 - 851) .

Part A

John is changing a lightbulb in a lamp. It's a warm summer evening, and the resistance of his damp skin is only 3300 ? . While one hand is holding the grounded metal frame of the lamp, the other hand accidentally touches the hot electrode in the base of the socket. The voltage of the socket is 120 V . Use the data shown in (Figure 1) .

You may want to review (Pages 850 - 851) .

Part A

What is the current through his torso?

Arm: 310 2 Rakin Arm: 310 ? Rakin Torso: 30 ? Leg: 290 0 Leg: 2900 Rskin Rakin Wherever current enters orthe torso between any leaves the body, two points (arm to arm, we add the skinarm to leg, leg to leg), this resistance When current traverses adds a resistance of 30 ?.

Explanation / Answer

First calculate the total resistance of the body.

This is -

R(total) = R(skin) + resistance of the rest body part = 3300 + 2*310 + 2*290 + 30 = 4530 ohm

Voltage of the socket, V = 120 V

Therefore,

Current through his torso, I = V / R(total) = 120 / 4530 = 0.0265 A = 26.5 mA.

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