Switch
Chapter7: Relays
Section: Chapter Questions
Problem 9SQ: What is optoisolation?
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Question
Consider the practical ammeter, described 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 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.
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