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Chapter 21: Q14CQ (page 771)
Explain which battery is doing the charging and which is being charged in Figure 21.45.
is charged, is doing the charging.
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Draw two graphs of charge versus time on a capacitor. Draw one for charging an initially uncharged capacitor in series with a resistor, as in the circuit in Figure 21.38, starting from\({\rm{t = 0}}\). Draw the other for discharging a capacitor through a resistor, as in the circuit in Figure 21.39, starting at \({\rm{t = 0}}\), with an initial charge\({{\rm{Q}}_{\rm{0}}}\). Show at least two intervals of\(\tau \).
If two household lightbulbs rated 60W and 100W are connected in series to household power, which will be brighter? Explain.
Two different automobile batteries on a store shelf are rated at and 鈥渃old cranking amps.鈥� Which has the smallest internal resistance?
Apply the loop rule to loop abcdefghija in Figure 21.52.
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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