Voltage, e.m.f, potential difference, coulomb??

Question

I don't really get these!!! Is voltage and coulomb related? Is voltage the electromotive force?

please help me!!! i really dont get this!

thanks btw!

Answer 1

.emf:elecromotiveforce

potential difference b/w 2 points when no current pass throgh it.it is the result of pd

&pd when there is current.it's the cause.......

Answer 2

A coulomb is a certain amount of electrons going past a certain point of  a circuit in a second. Google it or wikipedia it .That stuff was twenty years ago for me. I think it's 1 amp at 1 second = a coulomb

Answer 3

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coulomb is a unit of electric charge and it is quite a bigger unit.6.24 x 10^18 no. of electrons make 1 coulomb of charge.

Current flows between two points due to potential difference or voltage existing between the points.

e.m.f. is the term applicable to the sources of electricity like cell,battery,generator etc.EMF of a cell means the  potential difference across the terminals of the cell when there is no current drawn from the circuit. emf is measured with an apparatus called voltmeter. The unit of emf is volt.

Answer 4

Voltage, potential difference, and electromotive force (e.m.f) are all names for the same thing.  It is something that imparts energy to a charged particle.

A coulomb is a certain amount of electric charge.

Here's an analogy: imagine you are standing on the edge of a cliff over the sea and there are a bunch of rocks of different sizes around you.  If you drop a rock off of a cliff, the rock gains energy (kinetic energy in this case) as it falls.  The difference in height between the cliff and the sea causes the rock to make a splash of water of a certain size when it hits.  The more massive the rock and higher the cliff, the larger the splash, due to the rock having more energy at the end of the fall.

A voltage source acts similarly.  The height of the cliff corresponds to the potential difference in a battery, and the mass of the rock corresponds to the charge of the particle.  When a charged particle passes through a potential difference (aka voltage, aka emf), it gains energy.  The more charge that passes through a voltage source, the more energy that is released.  The larger the potential difference, the more energy imparted to the electrons, thus the larger the current.