OT. Please tell me how to calculate this

Thread Starter

AE35

Joined Dec 1, 2005
8
Hi all.

If I have a a bulb connected to a 3V battery how do I calculate how many C that has been passed through it, when it has used 30 J?

Thanks....hope I make sense.

Nicholas
 

thingmaker3

Joined May 16, 2005
5,084
Originally posted by AE35@Mar 2 2006, 01:03 AM
Hi all.

If I have a a bulb connected to a 3V battery how do I calculate how many C that has been passed through it, when it has used 30 J?

Thanks....hope I make sense.

Nicholas
[post=14534]Quoted post[/post]​
One volt equals one joule per coulomb. The rest is algebra: multiply both sides by C and divide both by volts.
V = J / C
C * V = J
C = J / v
C = 30J / 3v = 6.02x10^24 electrons.
 
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