Comparator
| The extremely large open-loop gain of an op-amp makes it an extremely sensitive device for comparing its input with zero. For practival purposes, if  the output is driven to the positive supply voltage and if  it is driven to the negative supply voltage. The switching time for - to + is limited by the slew rate of the op-amp.
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Electronics concepts
Op-amp concepts
| HyperPhysics*****Electricity and magnetism | R Nave |
at the slightest difference between its inputs. But there are many variations where the output is designed to switch between two other voltage values. Also, the input may be tailored to make a comparison to an input voltage other than zero.