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Old Apr 6th 2013, 08:33 AM   #1
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battery voltage

what do you mean by

'a battery of 6 volts'

I am confused does it mean that the battery can tranfer 6 coulomb of charge by spending 1 joule of energy per coulomb ?

and what about the time it takes to transfer the charge?

Please help
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Old Apr 6th 2013, 10:17 AM   #2
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Originally Posted by noddy View Post
what do you mean by

'a battery of 6 volts'

I am confused does it mean that the battery can tranfer 6 coulomb of charge by spending 1 joule of energy per coulomb ?

and what about the time it takes to transfer the charge?

Please help
Part of your question is what the unit "1 V" means.
The unit "V" is defined to be m^2kgs^-3A^-1
which is the same as J/C, energy divided by charge.
Thus the energy stored in the battery is Volts times Coulombs

A "6-V battery" means the potential difference across the battery when no current is flowing is 6 V. Batteries have some internal resistance, so when current IS flowing, the potential will be slightly reduced. Sometimes batteries are also specified by the amount of charge they can deliver, in units of current times time. When NOT specified, you can't tell how much charge or how fast.
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