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Chapter 27: Q. 1 (page 762)
electrons flow through a cross-section of a diameter iron wire in . What is the electron drift speed?
The electron drift speed is
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Suppose a time machine has just brought you forward from (post-Newton but pre-electricity) and you've been shown the lightbulb demonstration of FIGURE Q27.1. Do observations or simple measurements you might make-measurements that must make sense to you with your knowledge-prove that something is flowing through the wires? Or might you advance an alternative hypothesis for why the bulb is glowing? If your answer to the first question is yes, state what observations and/or measurements are relevant and the reasoning from which you can infer that something must be flowing. If not, can you offer an alternative hypothesis about why the bulb glows that could be tested?
The electric field inside a long copper wire is . What is the potential difference between the ends of the wire?
Pencil "lead" is actually carbon. What is the current if a potential difference is applied between the ends of a diameter, long lead from a mechanical pencil?
The biochemistry that takes place inside cells depends on various elements, such as sodium, potassium, and calcium, that are dissolved in water as ions. These ions enter cells through narrow pores in the cell membrane known as ion channels. Each ion channel, which is formed from a specialized protein molecule, is selective for one type of ion. Measurements with microelectrodes have shown that a diameter potassium ion channel carries a current of role="math" localid="1649134390247" .
a. How many potassium ions pass through if the ion channel opens for ?
b. What is the current density in the ion channel?
Which, if any, of these statements are true? (More than one may be true.) Explain. Assume the batteries are ideal.
a. A battery supplies the energy to a circuit.
b. A battery is a source of potential difference; the potential difference between the terminals of the battery is always the same.
c. A battery is a source of current; the current leaving the battery is always the same.
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