how potentiometer is superior than voltmeter explain
Answers
Answer:
Potentiometer is a null method device.At null point it does not draw any current from the cell and thus there is no potential drop due to the internal resistance of the cell. ... That is why a potentiometer is preferred over a voltmeter for measuring the emf of a cell.
Answer:
The potentiometer is an instrument used for measuring the emf, whereas the voltmeter is a type of meter which measures the terminal voltage of the circuit.
The potentiometer accurately measures the potential difference because of zero internal resistance. Whereas, the voltmeter has a high internal resistance which causes the error in measurement. Thus the voltmeter approximately measures the voltage.
The sensitivity of the potentiometer is very high, i.e. it can measure small potential differences between the two points. The voltmeter has low sensitivity.
The potentiometer uses the null deflection type instrument whereas the voltmeter uses the deflection type instrument.
The potentiometer has infinite internal resistance, whereas the potentiometer has high measurable resistance.