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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Find the currents flowing in the circuit in Figure\(21.52\). Explicitly show how you follow the steps in the Problem-Solving Strategies for Series and Parallel Resistors.
Some strings of holiday lights are wired in series to save wiring costs. An old version utilized bulbs that break the electrical connection, like an open switch, when they burn out. If one such bulb burns out, what happens to the others? If such a string operates on 120 V and has 40 identical bulbs, what is the normal operating voltage of each? Newer versions use bulbs that short circuit, like a closed switch, when they burn out. If one such bulb burns out, what happens to the others? If such a string operates on 120 V and has 39 remaining identical bulbs, what is then the operating voltage of each?
Show that if two resistors and are combined and one is much greater than the other : (a) Their series resistance is very nearly equal to the greater resistance (b) Their parallel resistance is very nearly equal to smaller resistance .
Refer to Figure 21.7and the discussion of lights dimming when a heavy
appliance comes on. (a) Given the voltage source is 120 V, the wire resistance is,and the bulb is nominally 75.0W , what power will the bulb dissipate if a total of 15.0 Apasses through the wires when the motor comes on? Assume negligible change in bulb resistance. (b) What power is consumed by the motor?
When making an ECG measurement, it is important to measure voltage variations over small time intervals. The time is limited by the \(RC\) constant of the circuit-it is not possible to measure time variations shorter than \(RC\). How would you manipulate \(R\) and \(C\) in the circuit to allow necessary measurements?
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