Efficiency

Efficiency

useful output energy transfer / total input energy transfer

power output/ power input

efficiency = useful________ / total________.

thermal energy store

wasted energy is usually transferred into the________.

100% efficient

no device is________.

electric heaters

the only devices that are 100% efficient are________.

insulating them, lubricating them or making them more streamlined

you can improve the efficiency by________.

transfer energy

useful devices are only useful because they________ from one store to another.

more efficient

the less energy that is wasted, the________ the device is said to be.

energy transfers

most________ involve some waste energy

electrostatic energy store

electrical heaters are 100% efficient as all the energy in the ________ is transferred to 'useful' thermal energy store.