eli5 the difference between watt-hours and Amp-hours?

Question

I’ve seen electricity being measured for like houses and stuff with kWh, but i always see on batteries it’s measured with mAh. what’s the difference? also, is there such thing as Volt-hours?

In: 6

Answer 1

Think of it like a backpack – watt hours measure how much stuff you can fit in the backpack and how heavy it is, while amp hours just measure how much stuff you can fit in the backpack. So watt hours tell you how much energy the battery can hold and how long it will last, while amp hours just tell you how much charge the battery can hold.