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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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