Question: how much electricity does a computer use in a year?
Answer: That's 105 watts x 10 hours/week x 52 weeks/year = 54,600 watt-hours, or 54.6 kWh. If you're paying 10¢ per kilowatt-hour, then you're paying about $5.50 a year to run your computer. That's quite a range, $5.50 to $631 a year.