Operational Amplifier
What exactly is an op-amp?
- Answer
- A very good voltage amplifier
How much current flows into the inverting input?
- Answer
- 0. Current flowing into either of the inputs of an ideal op-amp approaches zero.
Why can we start the KVL loop at non-inverting input?
- Answer
- The non-inverting input to the op-amp is also effectively grounded.
What would happen if there was positive feedback instead of negative?
- Answer
- With positive feedback an increase in the output would generate an even larger input which in turn would generate a larger output and so on… The output of the op-amp would therefore ‘run away’ so to speak.