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A circuit that measures the internal resistance of a practical ammeter is shown in Figure P2.74, where RS = 50,000 Q, VS = 12 V, and Rp is a variable resistor that can be adjusted at will.
a. Assume that ra « 50,000 Q. Estimate the current i.
b. If the meter displays a current of 150 μA when
Rp = 15 Q, find the internal resistance of the
IS = 120 mA. Find the voltage across R4 with and without the voltmeter in the circuit for the following values:
a. R4 = 100 Q
b. R4 = 1 kQ
c. R4 = 10 kQ
d. R4 = 100 kQ
meter ra .
IS 120 kÙ V
RS 4
Figure P2.74
Figure P2.77
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