But an iPhone's power requirements vary dramatically depending on how it's used for video, gaming, and other apps. And estimates for just how much data the average owner uses a month also vary widely, so the controversial study has What You Don't Know About Electricity.")

Whether your mobile phone's power use rivals your fridge or not, the chances are good that hidden energy hogs in your home are burning more power and money than that refrigerator—sometimes much more. Here are half a dozen surprisingly power-hungry devices that may be feeding your electric bill.

These familiar electronic arrays sit on or near many televisions to connect cable to our entertainment systems. But it's not just their clocks that run when no one