It depends on the output current. In general, the switching power supply is most efficient.
Using a more efficient washer and dryer along with an energy efficient dishwasher will save a good amount of money as well as changing to energy efficient bulbs.
a solar thermal is an energy efficient way of getting energy
A generator.
The only way to do that is with a transformer. They make inline transformers that convert 230 to 115 and they simply plug in inline.
There is actually no energy efficient light bulbs in a way to interpret in physical determination. Energy efficient means less Watts required per hour compared to non energy efficient.
Adding thermal energy increase the evaporation.
Friction would be the easiest way.
There are many things that make energy tracking efficient. One way is making sure the tracking system is consistent and accurate, this will ensure a smooth energy tracking experience.
In a basic way, but fuel efficient cars usually refers to gasoline or diesel cars that get great mileage per gallon, energy efficient refers to any vehicle including hydrogen, electric, and hybrid.
No. Mankind is currently incapable of converting mass to energy in a way efficient enough to turn cement into energy. If one were even going to do so with some advanced technology, one would likely not take the effort to create cement, and would simply convert the raw materials.
The "Energy Star" logo is an easy way to see if an appliance is energy efficient. You should also read the instruction manual, and know your product well enough to observe that it is working properly.
Only one way. Leave it unplugged!