An ammeter has an internal resistance of 50 Ω. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately
A. 55 Ω
B. 5.5 Ω
C. 50 Ω
D. 9 Ω
Answer: Option B
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Related Questions on Parallel Circuits
Five 100 Ω resistors are connected in parallel. If one resistor is removed, the total resistance is
A. 25 Ω
B. 500 Ω
C. 100 Ω
D. 20 Ω
When a 1.6 kΩ resistor and a 120 Ω resistor are connected in parallel, the total resistance is
A. Greater than 1.6 kΩ
B. Greater than 120 Ω but less than 1.6 kΩ
C. Less than 120 Ω but greater than 100 Ω
D. Less than 100 Ω
Va = Ia.Ra= 1mA . 50 ohm
Va= 50 mv
Vsh = Ish . Rsh
Rsh = Vsh/Ish
= 50mv/ (10mA - 1mA)