Question

What are the disadvantages of a potentiometer?

Answer 1

Disadvantages of a potentiometer over a voltmeter:

1. A potentiometer is an indirect measurement instrument, whereas a voltmeter is a direct reading instrument.
2. A potentiometer is unwieldy while a voltmeter is portable.
3. Unlike a voltmeter, a potentiometer requires a standard source of emf and calibration to measure an unknown emf.