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# Potential difference for point source vs parallel plates

## Question

Hi,

I was wondering whether to calculate the potential difference, is V=Electrical energy/charge and V=kq/r for point charges whereas deltaV=electric field*radius. Can u give me a reason to why this is so if this is the case.

Thanks!

## Recommended Posts

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All potential we talk about are potential difference (it's a relative measure), so V vs. Delta V is really just talking about point of reference.

V=Ed (or E=V/d) works for parallel plates because you have a uniform field between the plates.  What you're really getting into is a calculating of what electric field and potential difference mean.  If I may ask, are you in a calculus-based course or an algebra-based course?  If calculus-based, this may help:

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