Question

WHAT IS the difference between ELECTRO MOTIVE FORCE(emf) AND VOLTAGE

Answer 1

EMF is the potential difference across two terminal ends of a battery or cell in an \(OPEN\) circuit.
Voltage or Potential difference is the potential drop across two terminal ends of a battery in a closed circuit.
Also since the battery has some internal resistance of its own:
\[E = V + Ir\]
Where E is EMF(when circuit is open), V is potential diff(closed circuit) , I is current in closed circuit, and r is internal resistance of the battery.

Answer 2

Best Answer:-
"emf' is the potential difference across a source of electricity when there is no current through the source, i.e when the circuit is not closed.

It is the maximum potential difference across the source.

When the circuit is closed there is current inside the source and hence there is a drop of potential across the internal resistance of the source. Hence the potential difference across the terminals of the source will be less than the potential difference when there is no current.

The maxium potential difference is called emf of the source.

Voltage is the other word used for potential difference across any two points.

Answer 3

What is the force that is pushing the electrons to move.

Answer 4

"emf"

Answer 5

What are the units for EMF

Answer 6

this is units for EMF:- E.M.F: Is the potential difference between two terminals when there is no current i.e. circuit is open, therefore [EMF = OCV].

Answer 7

As you said in above discussion, voltage is potential difference. im confused

Answer 8

Now you are saying EMF is potential difference.

Answer 9

Difference between emf and voltage?
In: Electronics Engineering, Physics, Electrical Engineering, The Difference Between [Edit categories]

Answer:
E.M.F: Is the potential difference between two terminals when there is no current i.e. circuit is open, therefore [EMF = OCV].
OCV :open circuit voltage.
Voltage: Is the potential difference between two terminals when there is current i.e. closed loop

Answer

An e.m.f. (electromotive force) is a voltage or, more accurately, a potential difference ('voltage' is simply another word for 'potential difference'). However, it is the potential difference that appears across the terminals of a supply when it is not connected to its load. When the supply is connected to a load, this potential difference falls because of an internal voltage drop across the supply's internal resistance. So the simple answer is that an electromotive force is a supply's open-circuit terminal voltage.

Another definition is obtained from Kirchhoff's Voltage Law, from which we can say that an electromotive force is equal to the sum of all the all the voltage drops around the circuit, including its internal voltage drops.

Answer 10

thanks

Answer 11

it's ok