Chemistry Electrochemistry MDCAT 2018
PMDC Verified Question 57 of 73
The potential difference of an electrochemical cell is measured by:
A
Galvanometer
B
Calorimeter
C
Voltmeter
D
Ammeter
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Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Voltmeter
Concept:

Electrical potential difference, also known as voltage or electromotive force (EMF), is a measure of the driving force pushing electrons through a circuit.

Solution:

  • A Voltmeter is specifically designed with high internal resistance to measure the potential difference between two points in a circuit without drawing significant current itself.


  • In electrochemistry, it connects the anode and cathode to measure the cell's voltage.


Why other options are incorrect:

A galvanometer detects the presence and direction of minute currents. An ammeter measures the magnitude of electrical current (flow of charge), not potential. A calorimeter measures heat changes in thermodynamic reactions.

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