A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement. What is the half-scale resistance for this movement ?
Correct answer: A. 3 kO
- A. 3 kO
- B. kO
- C. kO
- D. 6 kO
Explanation
At half-scale in a series ohmmeter, the external resistance equals the meter's internal series resistance. With the battery producing full-scale current through the internal resistance, R = 3 V/1 mA = 3 kΩ, so the half-scale resistance is 3 kΩ.
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