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.
These are (together with the letter symbols used as abbreviations): 1  Volts(V) - A measure of the potential difference, emf (electromotive force), or voltage in a circuit. 2  Amps(A) - A measure of the current flowing in a circuit. 3  Watts(W) - A measure of the power developed by hte flow of current through a circuit.