A circuit you\'re building needs a voltmeter that goes from 0 V to a full-scale

Question

A circuit you're building needs a voltmeter that goes from 0 V to a full-scale reading of 5.0 V. Unfortunately, the only meter in the storeroom is an ammeter that goes from 0?A to a full-scale reading of 500?A. Fortunately, you've just finished a physics class, and you realize that you can convert this meter to a voltmeter by putting a resistor in series with it, as shown in the figure(Figure 1) . You've measured that the resistance of the ammeter is 50?, not the 0? of an ideal ammeter.

What value of R must you use so that the meter will go to full scale when the potential difference across the resistor is 5.0 V?

Explanation / Answer

R+50 = delta( V )/current   = 5 /(500 micro A)

R +50 = 10000

R = 9950 ohm

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