College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 20, Problem 10CQ
Does the resistance of an object depend on the path current takes through it? Consider, for example, a rectangular bar-is its resistance the same along its length as across its width? (See Figure 20.37.)
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A person with body resistance between his hands of 10.0 kΩ accidentally grasps the terminals of a 20.0-kV power supply. (Do NOT do this!) (a) Draw a circuit diagram to represent the situation. (b) If the internal resistance of the power supply is 2000 Ω , what is the current through his body? (c) What is the power dissipated in his body? (d) 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 this situation to be 1.00 mA or less? (e) Will this modification compromise the effectiveness of the power supply for driving lowresistance devices? Explain your reasoning.
9. (A) Consider the circuit in Figure on the right and assume the battery has
no internal resistance. Just after the switch is closed, what is the current in
the battery?
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time constant of the capacitor, what will the current be in the 2-2 resistor?
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A person with body resistance between his hands of 10.0 kΩ accidentally grasps the terminals of a 20.0-kV power supply. (Do NOT do this!)
If the internal resistance of the power supply is 2000Ω , what is the current through his body?
Chapter 20 Solutions
College Physics
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