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.
Watts are normally measured by the hour so that a 100 watt light bulb burning for 1 hour would consume 100 watt hours of electricity. To determine how much wattage a device will use we can multiply the amps times the volts and the resultant product will be the wattage. The formula AMPS X VOLTS = WATTS is very important to people who work with electricity. Conversely, Watts divided by Volts will equal Amps and Watts divided by Amps will equal Volts.