Energy Bills

54 watchers

ThorntonRunner Jul 2023 8:57pm, 12 Jul 2023 6,876 posts	0 ThorntonRunner Ours is 4.2l and is fine for the two of us. It's a fairly basic Tefal one, but can't remember exactly how much it was
Hanneke Jul 2023 9:37pm, 12 Jul 2023 106,394 posts	0 Hanneke I will have a look around. With the whopping big juicer I have very little space left in my kitchen!
rf_fozzy Jul 2023 10:53pm, 12 Jul 2023 20,605 posts	0 rf_fozzy "But you're right - light, infrared or radio waves would have been better analogies!" Well yes and no Microwave can technically be called a radio frequency. Although that depends on who you talk to. Microwave heating is just of a specific wavelength that induces dielectric heating of the polar molecules, like water resulting in highly efficient energy transfer. It's useful for this application as the wavelength is in the right range to stimulate the rotation of the polar molecules. And that transfer of energy from the photons to kinetic energy is what makes them efficient. High energy photons will result energy transfer to KE but won't induce the rotational energy and so it takesore to heat them up. As the energy gets higher, bond breakage of the molecules can occur (UV will do this hence why sunscreen is a good idea) or if they're high enough energy, pass straight through. Hence why although IR is higher energy, Which you can use to heat up, you don't induce the same rotation and so it's less efficient. Light is higher energy again. Gamma radiation which is even higher energy, although emitted by nuclear processes most commonly can also be generated by other processes and is part of the EM spectrum. However higher energy particles are different and are (generally) from nuclear processes. The most obvious of course being alpha and beta radiation from nuclear decay.
rf_fozzy Jul 2023 10:56pm, 12 Jul 2023 20,606 posts	0 rf_fozzy Btw, if you've not looked at kinetic theory, you should. It's a wonderful example of how you can use classical mechanics to explain everyday thermodynamics I taught it a couple of years ago and it's a.joy to go through from first principles.
Dave W Jul 2023 6:07am, 13 Jul 2023 13,508 posts	0 Dave W Playing a bit fast and loose with the word "Joy" there aren't ya, Fozzy?
jda Jul 2023 6:37am, 13 Jul 2023 15,113 posts	0 jda My physics didn’t go past school but isn’t there something about wave-particle duality?
HappyG(rrr) Jul 2023 7:41am, 13 Jul 2023 47,252 posts	0 HappyG(rrr) Wow. Think this has gone a bit past reassuring Hann that microwaves wouldn't nuke or irradiate her food! But thanks for explanation! G
RunningRonnie Jul 2023 9:38am, 13 Jul 2023 2,707 posts	0 RunningRonnie I've had an air fryer for years now, long before they were popular. I've never quite understood the hype that's going around now. It's just a wee oven. I use it for chips, that's about it.
Night-owl Jul 2023 11:01am, 13 Jul 2023 43,070 posts	0 Night-owl Is there much difference between a halogen oven and an air fryer I have the former well before the hype. When I moved here I had no over and was cheaper to buy one of these then a big oven 5 years later I have no regrets
Rosehip Jul 2023 2:23pm, 13 Jul 2023 29,378 posts	0 Rosehip Btw, if you've not looked at kinetic theory, you should. It's a wonderful example of how you can use classical mechanics to explain everyday thermodynamics I taught it a couple of years ago and it's a.joy to go through from first principles.