Eye Strain. When you stare at screens all day, your eyes can get tired. Take a break with the 20/20/20 rule. Look at an object at least 20 feet away for 20 seconds every 20 minutes, says Ivan Schwab, MD, a spokesman for the American Academy of Ophthalmology.
Once you have the dial on your volt meter set to measure voltage, simply touch the black lead to the negative (-) terminal on your battery and the red lead to the positive ( ) terminal on your battery.
Volt is the measure of how much force (newton) of the batch of electron (coulomb) was exert in some distance (metre). The quantity of volt is the work per electron. It would be hard to see but electron can push something in newton force unit too. To prove it you might create a magnetic field from electron.