If you have an electric meter, it shows energy consumed in Watts per hour. This energy has an amount, Joules that is. But in a battery there is energy stored that also has an amount. So it should be in Joules as well. But the unit is different: Ah,(or mAh).Why is that and what is the difference between these two u
In: Physics
An Ampere hour is a unit of charge, the ability of a material to interact with electromagnetic fields. A Watt hour is a unit of energy, how much work the system can do. Depending on the system and the conditions it’s in, you can do a lot of work with a smaller charge, or not a little bit of work with a big charge.
A battery can tell you how much charge it’s bringing to the system, but how much work the system can do with it, the battery can’t guess. Meanwhile the electric companies get their electricity by work, so they product is energy, so they charge you for the energy you use
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