Physics Help Forum How many joules are supplied to the battery?

 Electricity and Magnetism Electricity and Magnetism Physics Help Forum

 Nov 8th 2018, 06:33 AM #1 Junior Member   Join Date: Nov 2018 Posts: 4 How many joules are supplied to the battery? A 12-V battery requires a total charge of 40 ampere-hours during recharging. How many joules are supplied to the battery? Can someone explain what is ampere-hours also, plz.
 Nov 8th 2018, 07:23 AM #2 Senior Member   Join Date: Aug 2010 Posts: 404 An "Ampere" is a measure of electrical current. It is equal to one Coulomb of charge passing a point in one second. An "Ampere hour" is one Ampere current running for one hour. Since one Ampere is equal to one Coulomb of charge per second, and there are 60x60= 3600 seconds in an hour, "one Ampere hour" is equivalent to 3600 Coulombs of charge. 40 Ampere hours is 40x 3600= 144,000 Coulombs of charge. But the difficulty with your question is that "Coulombs" are not a measure of energy. There is NOT a specific amount of energy in "40 Ampere hours". topsquark and Asgar07 like this.
 Nov 8th 2018, 02:26 PM #3 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,343 12 volts times 40 amp-hr = 480 watt-hr. Given that 1 joule of energy = 1 watt-second, can you take it from here? oz93666 and Asgar07 like this.

 Tags battery, joules, supplied

 Thread Tools Display Modes Linear Mode

 Similar Physics Forum Discussions Thread Thread Starter Forum Replies Last Post A80 Electricity and Magnetism 3 Jan 27th 2016 05:22 AM noddy Electricity and Magnetism 1 Apr 6th 2013 09:17 AM nmyers77 Equilibrium and Elasticity 1 Oct 17th 2010 02:29 AM George321 General Physics 4 Feb 21st 2010 10:17 AM guitmusic11 Advanced Electricity and Magnetism 1 Feb 26th 2009 09:29 PM