How much electricity are you saving when you only boil enough water for 1 cup of coffee?

Good question.. if you bring a 12 cup pot of water from 72 degrees ferinheight to boiling at 212 at 100 wats, youll use 72,910 jules per 8 oz cup.. However, using the same wattage and starting teperature, but with only 8 oz, youll need only about 9,239 jules. Boiling one cup at a time is an energy savings of 87 percent!

Due to accelleration, as you excite molicules, there's an exponential output of energy effect so you'll actually use even less time and energy if you start with cold water to boil than room temp... thermodynamics are weird.

You can figure this out if you really want, but I don’t know that it’s worth the effort. If you’re using an electric kettle, I assume there is just one setting - on. In such case, time how long it takes to boil water for one cup and then three cups. You then need to know how much you pay for electricity - usually in units of kilowatts per hour (Kw/h). The average kettle uses about 3000 watts. This is the equivalent of 3 kilowatts. As such, the kettle uses 3 kilowatts per hour (or 3 kilowatts per 60 minutes). This is 0.05 kilowatts per minute. You would need to multiply this by the price you pay for electric. Still want to go through with it?

No idea