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Chapter 20: Q2PE (page 735)
A total of \({\bf{600}}\;{\bf{C}}\) of charge passes through a flashlight in\({\bf{0}}{\bf{.500}}\;{\bf{h}}\). What is the average current?
The value of the average current is \(0.333\;{\rm{A}}\).
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An electronic device designed to operate at any temperature in the range from \(-10.0掳{\rm{C}}\) to \(55.0掳\;{\rm{C}}\) contains pure carbon resistors. By what factor does their resistance increase over this range?
What is the current in milliamperes produced by the solar cells of a pocket calculator through which \({\bf{4}}{\bf{.00}}\;{\bf{C}}\) of charge passes in \({\bf{4}}{\bf{.00}}\;{\bf{h}}\)?
(a) A defibrillator sends a \({\bf{6}}{\bf{.00}}\;{\bf{A}}\) current through the chest of a patient by applying a \({\bf{10000}}\;{\bf{V}}\) potential as in the figure below. What is the resistance of the path? (b) The defibrillator paddles make contact with the patient through a conducting gel that greatly reduces the path resistance. Discuss the difficulties that would ensue if a larger voltage were used to produce the same current through the patient, but with the path having perhaps 50 times the resistance. (Hint: The current must be about the same, so a higher voltage would imply greater power. Use the equation for power: \({\bf{P = }}{{\bf{I}}^{\bf{2}}}{\bf{R}}\).)
What power is supplied to the starter motor of a large truck that draws \(250\;A\) of current from a \(24.0\;V\) battery hook-up?
You are riding in a train, gazing into the distance through its window. As close objects streak by, you notice that the nearby fluorescent lights make dashed streaks. Explain
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