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.
âThe potential difference, or change in electric potential, between two points is measured with a voltmeter. Current flows through a resistor because of a potential difference applied by a battery or power supply. Potential difference is commonly measured in units of volts (V) or millivolts (mV = 10-3 V).