it measures energy :)
and noodle soup temperratures
The orbital will be described with a number, followed by a letter, which may have a suffix. The number is the principal energy level. For example 2p, principal energy level 2; 5d principal energy level 5; 1s principal energy level 1.
There are 2 energy sublevels in the second principal.
Water speedometer
Principal energy levels are an atom's major energy levels, ranging in value from 1 to 7. Energy sublevels are contained within principal energy levels, and their number increases as the value of the principal energy level increases.
A wattmeter measures power, which is the rate of doing work, expressed in watts.An energy meter measures the amount of energy consumed, usually in kilowatt hours.The meter on the wall of your house is an energy meter.
the sun
Electrons in the outermost principal energy level are called valence electrons.
Principal quantum numbers (n).
Each period corresponds to the number of shells (energy levels) contained in the atom.
eletrical energy into mechanical energy
Probably a regular energy meter that is meant for you to use in your house.
SUN