When most people turn an electronic device off they expect it is truly off and not drawing any electricity.  In many cases that is not true.  They still may be drawing “phantom power”,  also called standby power, vampire power, etc.  “Phantom power” was described by the U.S. Department of Energy in 2008 as follows:

“Many appliances continue to draw a small amount of power when they are switched off. These “phantom” loads occur in most appliances that use electricity, such as VCRs, televisions, stereos, computers, and kitchen appliances. This can be avoided by unplugging the appliance or using a power strip and using the switch on the power strip to cut all power to the appliance.” Read more