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.
Steps. 1. Learn the formula. There is a very simple formula for calculating watts. All you need to know are the number of amperes (amps) and the number of volts. The formula is Watts = Amps x Volts. Ad. 2. Find the number of amps and volts. For an electronic device or appliance there should be an information sticker located somewhere on the back of the bottom of the item. This will contain the number of amps and volts in that device, which you'll use to calculate the wattage. 1  Volts, can also be called input voltage for your device and are often designated by a capital V.. 2  The amperage number will usually be smaller than the voltage number, and may include decimal numbers.