The equation describing how an operational amplifier (op amp) makes it seem as if they wouldn't have many uses, but op amps are perhaps the most common and useful analog integrated circuit. This video describe their general equation, gives a bit of history, and outlines some of their uses.
For more content, including videos, tutorials and practice problems, see:
https://www.electronx.ca/education/op-amps/
Next video in op amp series: https://youtu.be/S8Ek_9wcEIY
