In this video, Karen presents and introduction of op amps how various ways they can be used in circuits. At a basic level, op amps are quite simple. They compare the voltages at their two outputs and use the difference in voltages to determine how the signal is amplified. The differential voltage at the inputs often needs to only be a few microvolts to generate an amplified signals. To be able to finely control the gain, a feedback loop must be created between the op amp’s output and one of the inputs. This loop usually contains a resistor and/or capacitor to have finer control of the gain. Check out this Intro to Op Amps episode to learn more about how op amp works and a variety of its applications.