mV.
The abbreviation of electron is e−.
The abbreviation of "have not" is "haven't."
There would be no abbreviation for Houston, but the abbreviation for Texas is TX.
There is no abbreviation.
There is no abbreviation.
20 millivolts
1,000 volts = 1,000,000 millivolts
"Milli" means "thousand", so there are one thousand millivolts on one volt. 120 volts times one thousand, equals 120,000 millivolts.
Write one volt equals 1,000 millivolts at the top of your paper. This is the standard conversion of volts to millivolts. Write down the number of volts you need to convert in decimal form. For example, if you have four volts, write 4.0. Move the decimal point over three times to the right to convert your amount of volts to millivolts. For example if you have 4.0 volts, you would have 4000 millivolts.
Megavolts.
0.35 volts
4.5
-70 millivolts
A millivolt is one thousandth of a volt so 0.450 millivolts would be four hundred and fifty thousands of a volt.
50,000 mV
Those are two completely different units, with different physical 'dimensions', used to measure completely different types of quantities. They have no relationship, and neither can be converted into the other. It would be something like trying to convert your age from years to dollars per pound.
-70 millivolts.