When choosing an uninterruptible power supply, or UPS, determine how much energy is needed to run the computer and find a UPS with a battery that will store enough energy to accommodate the computer during a power failure. Find out the equation used to determine energy usage for computers, fax machines or telephones with information from acomputer technician in this free video on computers. Expert: Jonathan Ayres Bio: Jonathan Ayres has more than 25 years of computer industry experience with all types of computer hardware and operating systems. Filmmaker: Todd Green

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