Computer magazine PC Pro measured the electricity consumed by PCs, printers and TVs.
It found many devices were extremely hungry when it comes to eating power.
But a few minor adjustments could save people hundreds of pounds.
Turn it off
A CRT (cathode ray tube) monitor left on during the day and in standby mode during the night costs an equivalent in electricity over five years as a brand new flat screen monitor, it found.
"Most people could easily save £100 a year and a small-to-medium sized company should easily cut £5,000 off its bills just by following our advice," said Mr Ross.
To highlight the issue of wasted electricity, PC Pro has launched a Switch IT Off campaign, designed to make users and manufacturers more aware of the true cost of owning electronics.
"Even if you can't be bothered to save the planet, at least save yourself a few bob," said Mr Ross.
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