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
Batteries are, in many ways, electricity on easy mode. They use one specific voltage. This means that a bigger battery for the same purpose will have the same voltage, but will hold more energy in the form of more amp-hours. You *could* measure this in joules, but for batteries people choose to use amp-hours instead.
In something where the voltage varies, amp hours become much less useful. You are pretty much forced to use energy (joules). Since your house is AC the voltage is constantly going up and down, not to mention it runs through transformers both inside and outside of your house that also change it.
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