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.
Voltage (Volts)[edit] Voltage is a measure of the work required to move a charge from one point to another in a electric field. Thus the unit volt is defined as a Joules (J) per Coulomb (C). W represents work, q represents an amount of charge.