A direct current can be measured by________________?
Correct answer: B. a D.C. potentiometer in conjunction with a standard resistance
- A. a D.C. potentiometer directly
- B. a D.C. potentiometer in conjunction with a standard resistance
- C. a D.C. potentiometer in conjunction with a volt ratio box
- D. none of the above
Explanation
A potentiometer measures voltage directly, so current is found by passing it through a known standard resistance and measuring the voltage drop, using I = V/R. A voltage-ratio box is used for voltage scaling rather than directly determining current.
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