2 12V devices in series for a 24V drop?

[Mario]

I tried posting this in electrical forum, but post doesn't show up.

Guys, it's been a while since my DeVry school days, but shouldn't I be able to wire two identical devices in series and get 12V drop on each one on the M998 24VDC system?I'm thinking of getting some drink holders for example and seen that I could get some LED illuminated ones: EBAY LINK

If memory serves correctly, I should get equal drop for each load. Here is a quick google picture for voltage drop on DC series circuit:

 

[tennmogger]

Yes, at least Kirchhoff said so

Where you might run into trouble is if the identical devices draw different currents during their startup period, light spotlights, etc. You should be fine with low draw LED's. My 2c.

 

[ageregunner]

I am an about to be retired electronics technician, and yes, you should be able to do what you referred to.

 

[Mario]

I'm glad my $25,000 education paid off

 

[ColonelSanders]

EE here...
short answer: yes, should be fine

longer answer: LEDs tend to like being put in series, they are often built this way inside single devices. so putting two of those in series to get to 24v should be no problem. They have internal limiting resistors to make them play nicely anyway. As tennmogger said, this does not apply once you get to two slightly different devices. the current draw (or the equivalent resistance in your diagram) will change, and one will get much more than 12v, and the other much less.

 

[MWMULES]

Mario please in the future do not include Ebay or auction links in your threads. Thanks in advance.
• Do NOT post links to current eBay auctions or Craig's List ads that are not your own. You may post a link to your own auction/ad only if it is in an information/discussion thread about your vehicle/item. Do not start a post in the Conversations forum or your vehicle specific forum just to announce your auction/ad.

 

[swbradley1]

Oh yeah and

TotalRvalue = 22.5kohm
I = 2ma
E3-2 = 10V
E3-4 = 20V
E1-4 = 15V

 

[snowtrac nome]

also remember you need an isolated ground some items ground through the mounting base say like off road lights in this event it will be difficult to wire.