this post was submitted on 19 Oct 2023
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Does multiplexing a usb power cable from 2 cables into 1 impact energy efficiency? (sh.itjust.works)
submitted 1 year ago by SoySaucePrinterInk@sh.itjust.works to c/askelectronics@discuss.tchncs.de
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I have two led strips used for 2x27" monitor bias lighting. Each have their own USB cables for power. These two USB cables are plugged into a 2-port wall charger for a phone. I would like to use a 2x female to 1x male adapter to join the two USB cables into one, then plug it into a much smaller 1-port USB wall charger. The reason is due to my space constraints.

Will doing this impact its energy efficiency, ie using an adapter like this?

https://www.aliexpress.com/item/1005004340044483.html

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[โ€“] ChaoticNeutralCzech@feddit.de 1 points 1 year ago* (last edited 1 year ago)

He meant watts per meter, not minute โ€“ the strips can be cut and rejoined. As for the 5 Ah, no clue.

The circumference of a monitor is more than 1 m, so a charger of 3 A at least will be necessary for each. This is why I prefer higher-voltage strips where less current is required and higher resistance is tolerable. Anyway, the power is quite high and this could cause overheating problems.