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.
Assumptions.  1 Base model has an efficiency that just meets the national minimum standard for gas and electric water heaters. 2  Lifetime energy cost is the sum of the discounted value of the annual energy costs based on assumed water heater life of 13 years. $0.09 per kWh for electricity is the Federal average price in the U.S. 2  $0.93 per therm for gas is the Federal average price in the U.S. 3  Hot water usage estimates: 4  Average shower (8 minutes) = 10 gallons of hot water.