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# where does energy go? Watch

1. Where does energy go after it turns into a different form e.g. a hairdryer turns electrical into heat and sound. What happens to the heat and sound energy? It just dissapears into thin air after its been used? Well it can't because energy cant be created or destroyed... THis may be some easy concept but i'm only at gcse so jw.
2. I guess it's absorbed by other things? But, for example, with a hairdryer it will distribute evenly so there'll only be a negligible difference in temperature? I'm not sure, I'm rubbish at physics. :P
3. It lingers about in the atmosphere/room it's in until it is released to go somewhere else, which is why rooms with a lot of computers are always so hot.
4. I asked my physics teacher the same question and he said it will eventually be used in another form. I'm still unsure about the sound one though, how on earth is that transferred?!
5. (Original post by harrietx123x)
I asked my physics teacher the same question and he said it will eventually be used in another form. I'm still unsure about the sound one though, how on earth is that transferred?!
Hairdryer example I'd hazard a guess at eg.

Electricity -> Heat energy, amongst others...

Heat turns into kinetic as particles move faster? Then just becomes negligible but it's still there.. Then this kinetic energy in the particles might be transferred elsewhere in such as sound as the air blows past a door as it closes (as well as negligible heat energy due to friction?).. not taking into account the energy used / transferred to close the door! And so it goes on!!
6. Energy cannot be created nor destroyed. Like others said; it is transformed into another form.
7. (Original post by harrietx123x)
I asked my physics teacher the same question and he said it will eventually be used in another form. I'm still unsure about the sound one though, how on earth is that transferred?!
I'm guessing sound could be transferred to kinetic by vibrating the tiny hairs inside your ears. Just one example....
8. (Original post by biffyclyro27)
I'm guessing sound could be transferred to kinetic by vibrating the tiny hairs inside your ears. Just one example....
Doesn't sound vibrate the particles it travels through? :/ or am I just making that up?
9. I learnt this at OCR gateway P1 P2 P3. I'll use a radiator to explain what happens.
First, the radiator heats the air thus make air particles vibrate and expand so the air particles will have more kinetic energy. As the particles are expanded, they will be less dense so the flow to the top of room. when the reach the top of the room they will eventually become cold and some of the energy will be absorbed by objects i think. As the air becomes cold, it will fall to the bottom. This will happen over and over again (convection currents) until all energy is absorbed by objects. I think if the objects absorb heat energy and then emit thermal, infrared radiation which heats the room again. The radiation escapes the house. By the way, this is my explanation so I could be wrong.
10. (Original post by harrietx123x)
Doesn't sound vibrate the particles it travels through? :/ or am I just making that up?
sounds right to me... I don't know anything to be honest. I just made an educated guess...
11. (Original post by biffyclyro27)
sounds right to me... I don't know anything to be honest. I just made an educated guess...
Yeah, me too(':

Updated: June 12, 2012
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