Physics Help Forum Coulombs to Ampere-hours. Joules to Kilowatthours

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 Feb 14th 2010, 11:09 AM #1 Junior Member   Join Date: Feb 2010 Location: UK Posts: 17 Coulombs to Ampere-hours. Joules to Kilowatthours Coulombs are the usual unit of charge. Show that ampere-hours are an alternative unit. Joules are the normal units for energy. Show that kilowatthours are an alternative. Don't understand how o do this. Please answer and explain thanks.
 Feb 15th 2010, 12:06 AM #2 Member   Join Date: Jul 2009 Posts: 86 Hi george 1. Do you know the formula relating charge, current, and time? 2. Do you know the formula relating energy, power, and time?
 Feb 20th 2010, 01:57 PM #3 Junior Member   Join Date: Feb 2010 Location: Algeria Posts: 2 hello george, this my first post in this forum, i had read the rules and did not find a rule that prohibit direct answer questions of other members asking for answers. charge, time and current are related as follows: I=dq/dt in other words : Ampere=coulomb/second so we can write this: coulomb=ampere * second because hour=3600 second so charge (coulomb) can be expressed by ampere hour (ampere*hour) and about your second question: puissane is energy per second , ie: puissance=energy/time this leads to: energy=puissance * time we know that the unit of energy is joul, the unit of puissance is watt, unit of time is second. so joul can be expressed by watt second , or killowatt second , or as you asked killowatt hour i hope i could explain it to you well (english is not my native language)
Feb 20th 2010, 03:06 PM   #4
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 Originally Posted by theophyman hello george, this my first post in this forum, i had read the rules and did not find a rule that prohibit direct answer questions of other members asking for answers. charge, time and current are related as follows: I=dq/dt in other words : Ampere=coulomb/second so we can write this: coulomb=ampere * second because hour=3600 second so charge (coulomb) can be expressed by ampere hour (ampere*hour) and about your second question: puissane is energy per second , ie: puissance=energy/time this leads to: energy=puissance * time we know that the unit of energy is joul, the unit of puissance is watt, unit of time is second. so joul can be expressed by watt second , or killowatt second , or as you asked killowatt hour i hope i could explain it to you well (english is not my native language)
Welcome to PHF.
You should read once again the part
 Originally Posted by Forum Rules On helping with questions: Any and all assistance given to homework assignments or textbook style exercises should be given only after the questioner has shown some effort in solving the problem. If no attempt is made then the questioner should be asked to provide one before any assistance is given.
Songoku was trying to get George started. But with your full answer you just put songoku's help useless.
I hope it won't happen again. I do support your help, but not a full answer when the OP didn't show any work. Songoku's approach is in agreement with the rules while yours isn't. Thanks for your comprehension.
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If the problem is too hard just let the Universe solve it.

 Feb 21st 2010, 10:17 AM #5 Junior Member   Join Date: Feb 2010 Location: Algeria Posts: 2 thank you arbolis for the remark .

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