A voltage of about 200 V can be measured__________________?
Correct answer: B. a D.C. potentiometer in conjunction with a volt ratio box
- A. directly by a D.C. potentiometer
- B. a D.C. potentiometer in conjunction with a volt ratio box
- C. a D.C. potentiometer in conjunction with a known resistance
- D. none of the above
Explanation
A D.C. potentiometer is normally suited to relatively small voltages; a volt ratio box scales a 200 V input down to a range suitable for direct potentiometer measurement. A known series resistance is not the usual voltage-extension method.
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