A circuit you’re building needs a voltmeter that goes from V to a full-scale reading of 5.0 V. Unfortunately, the only meter in the storeroom is an ammeter that goes from 0 μA to a full-scale reading of 500 μA. It is possible to use this meter to measure voltages by putting it in a measuring circuit as shown in Figure P23.67. What value of R must you use so that the meter will go to full scale when the potential difference ∆V is 5.0 V? Assume that the ammeter is ideal.
Figure P23.67
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