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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
2.73     Consider the practical ammeter, described in Figure P2.73, consisting of an ideal ammeter in series with a 1-kQ resistor. The meter sees a full-scale deflection when the current through it is 30 μA. If we desire to construct a multirange ammeter reading
full-scale values of 10 mA, 100 mA, and 1 A, depending on the setting of a rotary switch, determine appropriate values of R1, R2,
and R3.
Â
I
Â
Â
Â
Switch
A
Â
VS         rm                  V
Â
Source              Load Voltmeter
RS = 25 kÙ
VS = 12 V
Â
Figure P2.75
Â
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