Chapter 28: Q. 22 (page 791)
Two of the three resistors in FIGURE EX28.22 are unknown but equal. The total resistance between pointsisis . What is the value of ?
Short Answer
The value of is
Chapter 28: Q. 22 (page 791)
Two of the three resistors in FIGURE EX28.22 are unknown but equal. The total resistance between pointsisis . What is the value of ?
The value of is
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Get started for freeA battery is a voltage source, always providing the same potential difference regardless of the current. It is possible to make a current source that always provides the same current regardless of the potential difference. The circuit in FIGURE P28.56 is called a current divider. It sends a fraction of the source current to the load. Find an expression for in terms of and You can assume that the load’s resistance is much less than
A 12 V car battery dies not so much because its voltage drops but because chemical reactions increase its internal resistance. A good battery connected with jumper cables can both start the engine and recharge the dead battery. Consider the automotive circuit of FIGURE P28.65.
a. How much current could the good battery alone drive through the starter motor?
b. How much current is the dead battery alone able to drive through the starter motor?
c. With the jumper cables attached, how much current passes through the starter motor?
d. With the jumper cables attached, how much current passes through the dead battery, and in which direction?
The capacitor in FIGURE begins to charge after the switch closes at.
a. What is a very long time after the switch has closed?
b. What isin terms of E,R, and C?
c. In this circuit, does localid="1649091794998" ? Explain.
d. Find an expression for the current I at time t. Graph I from to localid="1649091939933"
In FIGURE EX28.31, what is the value of the potential at points ?
A circuit you’re using discharges a capacitor through an unknown resistor. After charging the capacitor, you close a switch at and then monitor the resistor current with an ammeter. Your data are as follows:
Use an appropriate graph of the data to determine
(a) the resis-tance and
(b) the initial capacitor voltage.
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