Explain which battery is doing the charging and which is being charged in Figure 21.45.
is charged, is doing the charging.
When two batteries are connected then the battery with higher potential is responsible for charging another battery.
The battery is getting charged whereas is doing the charging as is at the higher voltage. Net effective voltage is 6 volts.
Hence, is charged, is doing the charging.
A heart defibrillator being used on a patient has an RC time constant of due to the resistance of the patient and the capacitance of the defibrillator. (a) If the defibrillator has an capacitance, what is the resistance of the path through the patient? (You may neglect the capacitance of the patient and the resistance of the defibrillator.) (b) If the initial voltage is, how long does it take to decline to?
Referring to the example combining series and parallel circuits and Figure 21.6, calculate in the following two different ways: (a) from the known values of and ; (b) using Ohm's law for . In both parts explicitly show how you follow the steps in the Problem-Solving Strategies for Series and Parallel Resistors.
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