Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to alt.home.repair,sci.electronics.repair
|
|||
|
|||
vampires and power usage
On Wed, 13 Jun 2007 14:51:20 -0400, "Zephyr" an address @ some place
..com wrote: Hey folks, I'm curious about power consumption of things like the power supply for my dell laptop its and AC/DC adaptor, and when the unit is charging my laptop it gets quite warm. from that I infer that its using a fair amount of power. now, if I leave it plugged into the wall, but remove the laptop, it does not heat up, but. there is a little light on it that indicates it is receiving power. aside from that little light, is it using any significant amount of power? The label on the unit says the input is 1.5a same question goes for my cell phone chargers 0.2a I understand that some of these things do use power constantly, but... how much? Good question. Not only the ones with wall warts, those black "adaptor" boxes that plug into the wall with a cord coming out of them, but many radios etc. with the transformers inside, have no switch in the primary of the power transformer, and they are ON all the time. For electronic reasons I don't well understand, when there is no current in the secondary of a transformer, there is higher impedance in the primary of the transformer, so less current flows even through the primary. The heat one can feel, that you feel, the waste heat would be iiac the same percentage of energy used, as when the device is running and there is current through the secondary. From your touch, it sounds like the current is a lot lower, but otoh, it's on all the time if the thing is plugged in, even for things that are only used an hour a year. Does anyone know what the percentage is, or how much these things use when off? xposted to sci.electronics.repair I found this link but it doesn't get into the Nitti gritty I was looking for http://gizmodo.com/gadgets/gadgets/c...act-181497.php Dave |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
vampires and power usage | Home Repair | |||
Oy where's me usage gorn? | UK diy | |||
NG usage survey | Home Repair | |||
Scope usage | Electronics Repair | |||
Please give you opinion on well pump power usage | Home Repair |