[PLUG-TALK] Hardware power supplies

[Josiah Luscher]

DC supplies are usually constant voltage, measured by an output voltage and a maximum power draw.  Match the voltage and provide sufficient power capability.  The laptop will use what power it needs moment by moment.  As long as the power load doesn't exceed the rated power supply you're golden.

You probably shouldn't use your 12 volt accessory on a 19v power supply though, that might let the smoke out.

Good luck!

On September 19, 2017 5:53:06 PM PDT, Rich Shepard <rshepard at appl-ecosys.com> wrote:
>When I bought the ThinkPad X200 it came with no power supply so I did a
>web search and saw that replacement supplies were available in both 65W
>and
>90W flavors. Not finding specific requirements for the X200 I bought a
>90W
>supply. Am I correct in assuming that since the tablet cam run with a
>65W
>supply that's all it will draw from the 90W unit?
>
>Another external accessory has the power supply socket labeled for 12v
>and
>I have a wall wart marked 19v. Will this power supply run the
>accessory's
>power supply too hot and shorten its life?
>
>It's been so long that I did anything with electronic power supplies
>I've
>forgotten all the electrical knowledge I knew way back then.
>
>TIA,
>
>Rich
>
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-- 
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