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.
The energy needed to push the electrons from one point to another point is called voltage or volts. The total amount of electrons flowing through a wire is called current and is measured in amperes or amps. It is similar to the amount of water flowing through a hose. Bigger hoses can move more water, and bigger wires can move more electrons. The more current (amps), the more force, just like the hose.