Consider the practical ammeter, depicted in Figure P2.73, consisting of an ideal ammeter in series with a 1 k? resistor. The meter sees a full-scale deflection when the current through it is 30 ?A. If we desire to construct a multi-range 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.
Known quantities:
Ammeter shown in Figure P2.73; Current for full-scale deflection; desired full scale values.
Find:
Value of the resistors required for the given full scale ranges.
Analysis:
We desire R1,R2, R3 such that Ia= 30 ?A for I = 10 mA, 100 mA, and 1 A, respectively. We use conductances to simplify the arithmetic:
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