Current Electricity and Electrical InstrumentHard
Question
A millimeter of range 10mA and resistance is joined in a circuit as shown. The meter gives full-scale deflection for current I when A and B are used as its terminals, i.e., current enters at A and leaves at B (C is left isolated). The value of I is
Options
A.100 mA
B.900 mA
C.1A
D.1.1 A
Solution
Between A and B
(9 + 0.9) × 10 × 10-3 = (I - 10mA) 0.1
⇒ 990 mA = I - 10mA ⇒ I = 1000mA = 1A
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