# measuring current and voltage

Discussion in 'General Electronics Chat' started by Dhwl325, Feb 8, 2007.

1. ### Dhwl325 Thread Starter New Member

Feb 8, 2007
2
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what is the difference between the two

2. ### beenthere Retired Moderator

Apr 20, 2004
15,815
283
Hi,

May I suggest you read the relevant section in Volume I of the E-book on this site? There's a good explanation in it.

3. ### RAH1379 Well-Known Member

Dec 13, 2005
69
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voltage is pressure and current is flow of electrons

4. ### m4yh3m Senior Member

Apr 28, 2004
186
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The unit of electric charge, the coulomb, is defined in terms of the ampere: one coulomb is the amount of electric charge (formerly quantity of electricity) carried in a current of one ampere flowing for one second.[3] Current, then, is the rate at which charge flows through a wire or surface. One ampere of current (I) is equal to a flow of one coulomb of charge (Q) per second of time (t).

Since a coulomb is approximately equal to 6.24150948×1018 elementary charges, one ampere is approximately equivalent to 6.24150948×1018 elementary charges, such as electrons, moving past a boundary in one second.

(Ripped from Wiki)

5. ### Dave Retired Moderator

Nov 17, 2003
6,960
145
6.24150948×1018 elementary charges would probably be more than all the electrons in the known universe! It should read 6.24150948×10^18

Dave

Edit: Ignore this nonsense about more than all the electrons in the known universe, the second bit still applies.

6. ### Ron H AAC Fanatic!

Apr 14, 2005
7,050
657
Errmmm, Dave... 10^18>>>>>>>1018.

7. ### Dave Retired Moderator

Nov 17, 2003
6,960
145
Lol! My stupidity!! 6.24150948×1018 ~ 6354, which is very few electrons! I made the bludder interpretting the exponential notation as 6.24150948 e+1018.

I will leave my boob up for all to see!

Dave

8. ### Ron H AAC Fanatic!

Apr 14, 2005
7,050
657
Yeah, I figured that's what you did.