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___________?
Correct answer: B. 5.5 Ω
- A. 55 Ω
- B. 5.5 Ω
- C. 50 Ω
- D. 9 Ω
Explanation
The shunt carries 9 mA while the meter movement carries 1 mA, so equal parallel voltages give Rsh = (1 mA × 50 Ω)/9 mA ≈ 5.5 Ω. This assumes the stated 50 Ω is the movement's internal resistance.
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