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Chapter 21: Q37PE (page 776)
Apply the loop rule to loop akledcba in Figure 21.52.
The loop rule to loop abcdefghija is:
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Before World War II, some radios got power through a 鈥渞esistance cord鈥� that had a significant resistance. Such a resistance cord reduces the voltage to a desired level for the radio鈥檚 tubes and the like, and it saves the expense of a transformer. Explain why resistance cords become warm and waste energy when the radio is on.
Calculate theof a dry cell for which a potentiometer is balanced when, while an alkaline standard cell with an emf of requiresto balance the potentiometer.
What is the internal resistance of an automobile battery that has an emf of and a terminal voltage of while a current of is charging it?
What are the largest and smallest resistances you can obtain by connecting a, a, and aresistor together?
To measure currents in Figure \({\rm{21}}{\rm{.49}}\), you would replace a wire between two points with an ammeter. Specify the points between which you would place an ammeter to measure the following: (a) the total current; (b) the current flowing through \({{\rm{R}}_{\rm{1}}}\); (c) through \({{\rm{R}}_{\rm{2}}}\) ; (d) through \({{\rm{R}}_{\rm{3}}}\) . Note that there may be more than one answer to each part.
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