A circuit youre building needs an ammeter that goes from 0
Chapter 28, Problem 28.95(choose chapter or problem)
A circuit youre building needs an ammeter that goes from 0 mA to a full-scale reading of 50 mA. Unfortunately, the only ammeter in the storeroom goes from 0 mA to a full-scale reading of only 500 mA. Fortunately, youve 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. Youve measured that the resistance of the ammeter is 50.0 , not the 0 of 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 50 mA? b. What is the effective resistance of your ammeter?
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