EMF (E''electromotive Force'') is another term for Volts, hence the E in electronic formulas and EMF is measured with a volt meter. A potentiometer is not a meter at all, it is a variable resistor
A voltmeter is used to measure voltage. A potentiometer is used to vary the amount of resistance in a circuit - it has nothing to do with measuring.
The Ammeter XD
A voltmeter.
Say 'emf' instead potential difference. Because while measuring the same no current is drawn and just balancing the potential across with the potential drop on the balancing length of the potentiometer wire. While balancing the galvanometer shows null deflection. So no current flows through the galvanometer. A perfect balance with the potential difference (EMF) of a cell with potential drop across that particular length.
Since voltage is electrical potential difference, to measure the voltage across a component, you place the voltmeter across, or in parallel with, the component.
A voltmeter is used to measure voltage. A potentiometer is used to vary the amount of resistance in a circuit - it has nothing to do with measuring.
you can, but you will not get accurate answer as voltmeter consumes some current. so, potentiometer is used instead to measure emf ---- the potentiometer must be set to the expected emf from the cell before you put the zero detector in circuit if its set too high it will charge the cell too low it will load the cell perhaps if you dont know the voltage of the cell before you measure it you should get a hi impedance voltmeter(electrometer) to set the potentiometer as close as you can manage before you connect the zero detector
A voltmeter measures potential difference across a component, which may not necessarily be equal to the EMF of a cell due to internal resistance in the cell and voltage drops across other components in the circuit. To accurately measure the EMF of a cell, a potentiometer or a high-resistance voltmeter is used in conjunction with a null point method.
Use a voltmeter.
"voltmeter"
To measure the total emf simply connect the battery and voltmeter with the right terminals , but to measure the terminal potential difference which is less than the emf the voltmeter is connected in parallel with the battery
A potentiometer is a variable resistor, while a voltmeter is a device that measures voltage.
Voltmeter is a device to measure EMF and potential difference in terms of volts Thermometer is a device to measure the temperature in terms of K(kelvin),C(Celsius) F(Fahrenheit)
You can measure the emf of a cell by using a voltmeter, as this draws current from a cell. You can use the voltage, the emf, and the load resistance to determine the internal resistance of the cell.
Bcoz the emf which is to be measured is less than emf of driving cell....
A potentiometer is able to measure very small changes in voltage by allowing the user to manually adjust the resistance until the desired voltage is reached. This control over the resistance provides a more precise and accurate measurement compared to a voltmeter, which simply displays the voltage at a fixed range without adjustment.
Operating Principle: In x-y recorder, an emf plotted as a function of another emf, this is done by having 1 cell balancing potentiometer controlling the position of paper provided while another cell balancing potentiometer control the position of recording pen.