In unit gain amplifier output follows exact input and is known as a voltage follower.

Electrometer amplifiers are a special type of amplifiers used for the amplification of very low level signals.

Slew rate is defined as the maximum rate of change of output voltage. For ideal op-amp slew rate should be infinite.

Isolation amplifier is an amplifier with supply and output circuit galvanically isolated. Galvanic isolation means separation of functional units to prevent current flow.

For an inverting amplifier positive terminal of input should be connected to a negative input terminal of 741 IC that is pin number 2.

Inverting mode of operation is employed for op-amp as a filter circuit, that is high pass and low pass filters.

CMRR or common mode rejection ratio of a differential amplifier is the ability to reject common mode signals. For ideal characteristics, the amplifier will have infinite CMRR.

For an instrumentation amplifier, input impedance should be very high.

Zero output for zero input is a characteristic of an ideal op-amp. That is there will be no output for zero input.

In 741 IC pin number 4 is a negative supply, which is used to connect negative terminal of supply voltage.