A circuit that measures the internal resistance of a practical ammeter is shown in Figure P2.74, where RS = 50,000 ? , vS = 12 V, and Rp is a variable resistor that can be adjusted at will.
a. Assume that
ra ? 50,000? . Estimate the current i .
b. If the meter displays a current of 150 ?A when Rp = 15? , find the internal resistance of the meter ra .
Known quantities:
Schematic of the circuit shown in Figure P2.74; for part b: value of and current displayed on the ammeter.
Find:
The current i; the internal resistance of the meter.
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