Chapter 28: Q. 8 (page 789)
A battery with internal resistance r is connected to a load resistance R. If R is increased, does the terminal voltage of the battery increase, decrease, or stay the same? Explain.
The battery's terminal voltage will rise as the load resistance rises.
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The five identical bulbs in FIGURE are all glowing. The battery is ideal. What is the order of brightness of the bulbs, from brightest to dimmest? Some may be equal.
A.
B.
C.
D.
A 50 mF capacitor that had been charged to 30 V is dis-charged through a resistor. FIGยญURE P28.70 shows the capacitor voltage as a function of time. What is the value of the resistance?
What is the equivalent resistance between points a and b in FIGURE EX28.28?
A circuit youโre building needs an ammeter that goes from to a full-scale reading of . Unfortunately, the only ammeter in the storeroom goes from to a full-scale reading of only . Fortunately, youโve just finished a physics class, and you realize that you can make this ammeter work by putting a resistor in parallel with it, as shown in FIGURE P28.57. Youโve measured that the resistance of the ammeter is, not theof an ideal ammeter.
a. What value of R must you use so that the meter will go to full scale when the current I is?
b. What is the effective resistance of your ammeter?
What is the time constant for the discharge of the capacitors in FIGURE EX28.33?
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