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Chapter 21: Q7CQ (page 771)
Would your headlights dim when you start your car鈥檚 engine if the wires in your automobile were superconductors? (Do not neglect the battery鈥檚 internal resistance.) Explain.
As a result, when you start your vehicle, your headlights dim.
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Specify the points to which you could connect a voltmeter to measure the following potential differences in Figure \(21.49\): (a) the potential difference of the voltage source; (b) the potential difference across \({R_1}\) ; (c) across \({R_2}\) ; (d) across \({R_3}\) ; (e) across \({R_2}\) and \({R_3}\) . Note that there may be more than one answer to each part.
Why is the power dissipated by a closed switch, such as in Figure 21.43, small?
Aammeter is placed in series with aresistor in a circuit. (a) Draw a circuit diagram of the connection. (b) Calculate the resistance of the combination. (c) If the voltage is kept the same across the combination as it was through theresistor alone, what is the percent decrease in current? (d) If the current is kept the same through the combination as it was through theresistor alone, what is the percent increase in voltage? (e) Are the changes found in parts (c) and (d) significant? Discuss.
What is the voltage across the open switch in Figure 21.43.
A heart pacemaker fires 72 times a minute, each time a 25.0-nF capacitor is charged (by a battery in series with a resistor) to 0.632 of its full voltage. What is the value of the resistance?
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