There's some electric heaters that waste as much as ~10% of their energy as light, but luckily houses are full of sockets near the ceiling to put them in so you can make some use of that wasted light to read by, etc. B^>
Rgds
Damon[ Parent ]
Good point though ;-)
."Slowly changing the world, one watt at a time!"[ Parent ]
No, all other things (eg box dimensions and construction) being equal.
But heat is a VERY low grade form of energy, eg 1kWh of heat can typically only make maybe a third of 1kWh of electricity or light and conversely 1kWh of electricity can make and pump considerably more than 1kWh of heat.
So the '100%' efficiency is a bit misleading.
Like I could burn books for heat fairly efficiency for example, maybe 100% in one of those boxes of yours, but that's missing most of their value.
