Why adjust 7815, a fixed-voltage regulator?

Pot calling the kettle back. The difference between you telling me I was wrong, and me telling the other guy he was wrong, and the other guy telling me I was wrong is that of the three of us, only I was on topic.
The topic is literally asking why anyone would adjust a fixed reg like a 7815 instead of using an "adjustable" 317. NareshBrd and myself gave valid answers why. The person who is wrong and dragging things off topic is you.
 
BTW it is Volt, Ampère, Watt etc. so 15V DC. Writing stuff right on a technical forum is fun. You should try it!
Actually, it's volt, ampere, watt, etc. Units are not capitalized when written out. Also, there should be a space between the number and the unit. So it'd be 15 V DC. Just as you would write fifteen volt DC not fifteenvolt DC.

Just saying. 😉

Tom
 
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Me and NIST ( full specs of SI units standard) disagree. All units named after a human (Volt, Watt, Ampere, Kelvin, etc) are capitalized. All magnitudes above 10e6 are capitalized. The others are not. As exception are all the computer units that follows an independent standard.

Table of basic units according to NIST
Screenshot_20231211-220545.png
 
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