Question

Resistance is measured using _________

(a) constant current source

(b) constant voltage source

(c) variable current source

(d) variable voltage source

I had been asked this question during an interview.

The above asked question is from Digital Multimeter in section Electronic Instruments of Electrical Measurements

Answer 1

Correct answer is (a) constant current source

For explanation I would say: Constant current source is used to measure resistance in a digital multimeter. Standard known value of current is passed through an unknown resistance and the drop in voltage across the resistance is measured.