Chapter 28: Q. 23 (page 791)
What is the value of resistor R ?
Short Answer
The value of resistor R is.
Chapter 28: Q. 23 (page 791)
What is the value of resistor R ?
The value of resistor R is.
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Get started for freeA 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?
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.
Draw a circuit diagram for the circuit of FIGURE EX28.2
is how many joules?
Are the two resistors in FIGURE Q28.7 in series or in parallel? Explain.
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