Comment on If we can use hydrogen to power electric motors, why can’t we use water to run a car?

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dustyData@lemmy.world ⁨9⁩ ⁨months⁩ ago

Electric heaters aren’t 100% efficient, because some of the energy is wasted altering the resistive material chemistry and emitting other electromagnetic radiation, and even sound, that doesn’t heat the air inside your house (right away). Still at a perfect 100% efficiency, it takes 1 joule to raise your house temperature by 1 joule, ideally. Heat pumps, which are just an AC unit running in reverse, are more efficient than electric heaters. Some heat pumps have a coefficient of 3. Meaning they take 1 joule to heat the air in your house by 3 joules. Because they don’t try to heat the air, they move heat to the air from outside, and they can achieve this even if outside is freezing.

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