Chapter 28: Q. 16 (page 790)
What is the value of resistor in FIGURE ?
Short Answer
The value of resistor is.
Chapter 28: Q. 16 (page 790)
What is the value of resistor in FIGURE ?
The value of resistor is.
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A lightbulb is in series with a resistor. The lightbulb dissipates when this series circuit is connected to a battery. What is the current through the lightbulb? There are two possible answers; give both of them.
What power is dissipated by the resistor in ?
Bulbs A, B, and C in FIGURE Q28.10 are identical, and all are glowing.
a. Rank in order, from most to least, the brightnesses of the three bulbs. Explain.
b. Suppose a wire is connected between points 1 and 2. What happens to each bulb? Does it get brighter, stay the same, get dimmer, or go out? Explain
A circuit you’re 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, you’ve 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. You’ve 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?
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