Two voltmeters with ranges of 0 to 100 V has sensitivities as 10 kΩ/V and 20 kΩ/V. What is the maximum voltage that can be measured when these voltmeters are connected in series?
- A. 200 V
- B. 150 V
- C. 100 V
- D. None of the above
Answer: B. 150 V
Explanation: R1 = 100 × 10k = 1 MΩ (I1max = 0.1 mA); R2 = 100 × 20k = 2 MΩ (I2max = 0.05 mA). Max safe series current is limited to 0.05 mA: Vmax = 0.05 mA × (1 MΩ + 2 MΩ) = 150 V.