The emf is not a force at all, but the term ‘electromotive force’ is used for historical reasons. In any circuit Potential difference between two points is almost equal to the Electromotive force between them , and thee measure of PD is almost same as that of EMF also the both have same units i.e.

https://openstax.org/books/university-physics-volume-2/pages/1-introduction, https://openstax.org/books/university-physics-volume-2/pages/10-1-electromotive-force, Creative Commons Attribution 4.0 International License, Describe the electromotive force (emf) and the internal resistance of a battery, Entering the given values for the emf, load resistance, and internal resistance into the expression above yields, Here, the internal resistance has increased, perhaps due to the depletion of the battery, to the point where it is as great as the load resistance. Battery testers, such as those in Figure 10.9, use small load resistors to intentionally draw current to determine whether the terminal potential drops below an acceptable level. often estimated with reference to the upon a unit's area. Although it is difficult to measure the internal resistance of a battery, battery testers can provide a measurement of the internal resistance of the battery. This causes the terminal voltage of the battery to be greater than the emf, since V=ε−IrV=ε−Ir and I is now negative. - abV, abV No Comment, June 22, 2020 • The potential difference is defined as which caused current to flow within the closed circuit . - V, 57600 square-foot to square-yard-international. It is the Volt that “pushes” an electric current, measured in Amperes, through whatever Resistance (Ohms or Impedance) to produce work, measured in Watts. If the electromotive force is not a force at all, then what is the emf and what is a source of emf? A simple model for a battery consists of an idealized emf source εε and an internal resistance r (Figure 10.6). This increases the potential energy of the charges and, therefore, the electric potential of the charges. The lower-potential terminal is sometimes called the negative terminal and labeled with a minus sign. To contact the electricity industry’s EMF Unit Public Information Line (UK only): telephone 0845 7023270 or email EMFHelpLine@nationalgrid.com. \(Volts=\frac{Joules}{Coulombs}\) Dimension of Electromotive Force. Both plates are immersed in sulfuric acid, the electrolyte for the system. 4.0 and you must attribute OpenStax. It is equal to the potential difference across the terminals of the cell when no current is flowing. The internal resistance of rechargeable nickel-cadmium cells, for example, depends on how many times and how deeply they have been depleted. It generally increases as a battery is depleted, due to the oxidation of the plates or the reduction of the acidity of the electrolyte. The emf is equal to the work done on the charge per unit charge (ε=dWdq)(ε=dWdq) when there is no current flowing.


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