Physics

[dunbaranne]

Which SI unit may be expressed in terms of an ampere second per volt?

[shammydodger]

Farad

[JoolsTwo]

Coulomb - dunbaranne could you put all your question into one post - Please. They take up less space that way.

[shammydodger]

Jim

Surely an Ampere second is a coulomb, because an Ampere is a Coulomb per second. Thus, an Ampere second per volt is equivalent to a Coulomb per volt, which is a Farad.

[dunbaranne]

Thank you for yr answers but is it coulomb or farad?

[shammydodger]

Well, I'm biased dunbaranne, but even with my rudimentary knowledge of physics, I do know that an Ampere second is the same as a Coulomb, so a coulomb per volt cannot be a Coulomb. I would be prepared to back my answer with a cyberwager.

[pandabear]

I would think that the answer being looked for is COLOUMB

My understanding is .... a Coulomb is a unit of electric charge and is derived from the units of ampere seconds. That is, a Coulomb is the quantity of electric charge transferred each second by a current of one ampere.

(The meter-kilogram-second unit of electrical charge.)

[pandabear]

whoops .. my spelling !!

Coulomb

[shammydodger]

Pandabear

It's the other way around, in that an Ampere is derived from a Coulomb. The Coulomb is the amount of charge, while the Ampere is the amount of charge per second. That is, an Ampere is the same as a Coulomb per second. Thus, an Ampere second is the same as a Coulomb per second, multiplied by a second. The "second" thus cancels out with the "per second", so that an "Ampere second" is the same as a Coulomb. So, an "Ampere second per volt" is the same as a "Coulomb per volt", which are units of capacitance. The SI unit for capacitance is indeed a Farad (I've just looked it up to satisfy myself). Now, if this is a quiz or crossword question and the answer being looked for is "Coulomb", then I would suggest that the answer being looked for is incorrect.

And here is a link to back this up (the usual proviso about Wikipedia included):

http://en.wikipedia.org/wiki/Farad