What is the difference between pd and emf

Want create site? Find Free WordPress Themes and plugins. Did you find apk for android? You can find new Free Android Games and apps. EMF is the utmost difference of potential between the two electrodes of the cell when no current is drawn off from the cell i. PD is the difference of potential between any two points in a closed electric circuit. See you in next post have a good day. I am a professional engineer and graduate from a reputed engineering university also have experience of working as an engineer in different famous industries.

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Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. The potential difference between two points in an electrical or electronic circuit represents the work involved or the energy released in the transfer of a unit quantity of electricity from one point to the other.

Effectively, the potential difference is the difference in the electric potential between two points. Energy is released when a charge is moved from a point of higher potential to a point of lower potential. Often this is in the form of heat. Take the example of a current flowing through a resistor where some heat is released as the current flows from the point of a higher potential to a point of lower potential.

This means that the potential is the voltage at a given point in a circuit, not the source of the force to move it around the circuit. The key point to remember is that EMF is the cause, i. To explain the difference between EMF and PD, take the example of a simple battery used to power a circuit. Normally on the outer package of the battery itself the voltage will be stated: often 1. However it is found that when the battery is in use its voltage will fall, especially when larger loads are applied and as it becomes older and it has been used.

Even when the cell or battery is new, some voltage drop will be seen when it supplies current. The reason for this is that there is some resistance inside the cell. From this it is possible to define the EMF as the the driving potential within any electrical or electronic source regardless of any internal resistance.

It is effectively the voltage seen on the output of the source, i.