Posted by MarkB_MI on February 10, 2013 at 07:09:14 from (75.219.47.197):
In Reply to: Cell Phone Question. posted by Kevin B from Illinois on February 10, 2013 at 06:51:28:
When the charger is plugged in but not in use, it is mostly an energy storage device. That is, its power factor is close to zero, so even though current travels through its transformer winding, it just momentarily stores energy in the transform then returns it to the grid 120 times per second.
Note I said the power factor is "close to" zero. It's not zero due to resistance in the device and eddy current losses. That's why it gets warm. The energy lost in the device is converted to heat. The power consumed by a single inactive charger isn't much. But multiply it by all the similar devices in a typical home, and it does add up. Multiply that by the number of homes in the country, and you have a significant amount of power being consumed by chargers that aren't in use.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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