When did he discovered? Do you mean what? He discovered Yellow Fever was transmitted by mosquitoes. And if you mean when did he discover it, then the answer you are looking for is he led a research team that discovered this in 1900.
Coal IS commonly used. Coal provides 40 % of the world's elecricity and over 70% of steel production. It may not be entirely desirable, but it's still relatively cheap and useful.
J.J.Thomson has discovered the electron in 1897
It is not known where exactly in England sodium was discovered. It was discovered by Sir Humphrey Davy in 1807.
Alexander Fleming discovered penicillin in 1928
I think the main advantages of elecricity that it is safe ,cheap and clean .
power plants
elecricity?
yes
There's not one.
They are burned
Usually from the electrical outlet.
household electricity is called alternating current because when you have elecricity in your home,your elecricity will travel all over your house to make the electricity flow.
Either a battery or a generator
Yes, of course they do.
No, cars run on fuel or elecricity.
Most metals are good conductors of electricity.