3 ms·
> Birthday cards use tiny batteries. And piezoelectric buzzers https://en.wikipedia.org/wiki/Buzzer https://en.wikipedia.org/wiki/Buzzer > but articles like t
by yetihehe 5y ago
> Birthday cards use tiny batteries.
And piezoelectric buzzers https://en.wikipedia.org/wiki/Buzzer https://en.wikipedia.org/wiki/Buzzer
> but articles like this say they can get up to 1W out of it
Yeah, but they are getting electricity from light, sonoluminescence generates light, not electricity and author even singled out light as being something different than electricity, you can have light from electricity according to him.
- jimhi 5y agoInteresting, thanks. Is there anything you know of that does the opposite? Uses pressure to generate electricity?
- yetihehe 5y agoPiezoelectric crystals. Change in pressure causes electricity flow. They are used in piezoelectric lighters and in some microphones. Buzzers from birthday cards can work both ways, as a microphone (pressure->electricity) and as a speaker (electricity->pressure).