Did you know that even when household appliances are turned off, most are still using some electricity ? Good magazine has an interesting chart in their latest issue that details how much energy your vampire devices use, and how much it costs you to keep them plugged in. You can see the interesting vampire shaped illustration here. For example a plasma TV, for instance, can cost about $160 per year just to keep plugged in. I’m sure that this guide will be quite useful for those people who want to earn every penny. – Via – Lifehacker