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Good Day, I am thinking the opposite from this last entry (JM) but have no background in electrical theory. I have a lot of appliances I plug/unplug w/a little box in-line (I assume "transformer"). Some of the appliances are expensive (e.g., laptop computer).

Is it better for my appliance to plug into the wall receptacle and then into the appliance or the opposite?

  • Hello, and welcome to Home Improvement. It's a little hard to understand your question, even after @manassehkatz's work. Would you put a bit of time into cleaning it up? And, you should probably take our tour so you'll know how best to participate here. – Daniel Griscom Jul 15 at 14:31
  • that's Ok, 'short termer' here. Got what I need, ppl were very gracious - as U have indicated I have trouble expressing my self (got learning disability directly effecting all this) plus don't have the ele. theory, vocab & understanding to wrd the Q well. Thanks for the offer Dan ! – Chad Jul 22 at 15:29
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I have never heard it matters whether the "power supply" (converts mains ac to lower voltage DC) is plugged into the appliance first or into the mains electric receptacle first.

A theoretical speculation could be that the power supply would generate damaging transients when it is first plugged into the mains power, but if they would do this, then when the power was interrupted it would damage the appliance.

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    I always plug the laptop power brick into the supply first, then plug the charging lead into the computer... – Solar Mike Jul 14 at 15:02
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    I have seen a very short duration blue spark at the receptacle & wish to avoid similar at the laptop or appliance. Am thinking of durability and expense... – Chad Jul 14 at 15:56
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    Don't worry about a small blue spark, unless you are in a chemical plant. I get that on cell phone chargers. That is simply inrush current and the luck of favorable lighting that allows you to see it. – Harper Jul 14 at 17:12
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    To be clear, inrush current is a characteristic of the device, usually the power supply charging capacitors, or other radically nonlinear things. Your laptop's power brick may have this characteristic, but your laptop may not. – Harper Jul 14 at 17:19

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