It's pretty cool.  You can measure your appliances consumption.  Just check out a Kill A Watt device from San jose public library.  You can test your appliances with it. You will learn how efficient they are and help to find power-wasting appliances.    It will also calculate your electrical expenses by the day, week, month and even an entire year.

Come to the library and check it out!! 

Ask for the Kill-A-Watt devices at the info desk at any San Jose Public Library.