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Power consumption: How much are your gadgets costing you?

With Earth Hour making us aware of the need to conserve electricity, we conduct a real-world test to see just how much our TVs, computers and other home electronics equipment costs to run.

Apple iMac (20-inch, 2.66GHz Intel Core 2 Duo, 2009)

A few other all-in-ones make this 20-inch iMac look expensive on a dollars-per-screen-inch basis, but none are as attractive or as capable juggling multiple programs. With a fast dual-core CPU and a strong array of features, Apple's updated all-in-one will slide seamlessly into a variety of roles at home or at work.