A person who studies the origin of the words and its meaning is called an etymologist. Etymology is a branch of linguistics. I think all these are terms are named in English language, in every developed language there is a different term for each studies.
The wisdom of using an electric heater depends on the per kilowatt cost in your region. 1  If your heater has a 1000 watt rating and your cost of electricity is $0.15/Kwh your cost to operate for one hour would be $0.15. 2  If the element is activated 10 hours out of every 24 hours your cost per day would be $1.50.
Calculating Energy Usage. An average water heater runs three hours daily. An 50-gallon, 5,500-watt water heater with a .90 EF and an electricity rate of $.16 per kilowatt hour will cost $781 to operate each year.Most water heaters include a label listing the annual operating cost.or electric heaters, EF ranges from 0.75 to 0.95. The amount of electricity used by an electric water heater depends on the size of the water tank, the amount of water used, the temperature setting of the water heater, and whether the tank is insulated.