Examine the data sheet schematic of the 741 operational amplifier. Now insert the 741 operational amplifier in the breadboard. Attach the positive lead of the first power supply to the voltage supply pin of the 741 (Pin 7). Attach the negative lead of the second power supply to the negative supply pin of the 741 (Pin 4).
Insert a 20,000-ohm resistor into your breadboard. Connect the left end of the 20,000-ohm resistor to the 741's output pin (Pin 6). Connect the right end of the 20,000-ohm resistor to the negative input pin (Pin 2) of the amp.
Insert a 2,000-ohm resistor into the breadboard. Connect the right end of the 2,000-ohm resistor to the negative input pin (Pin 2) of the amp. Connect the positive terminal of the waveform generator to the left end of the 2,000-ohm resistor. Connect the negative terminal of the waveform generator to the positive input terminal of the 741 (Pin 3). Now connect the negative terminals of the two power supplies together and to the negative terminal of the waveform generator.
Connect the positive lead of the oscilloscope probe to the output pin of the 741 (Pin 6) and the negative terminal of the oscilloscope to the negative terminal of the waveform generator. Set the peak-to-peak voltage of the waveform generator to 0.1 volts. Now set the peak-to-peak voltage scale of the oscilloscope to 5 volts per division. Turn on the power supplies and set each to 15 volts.
Turn on the waveform generator and the oscilloscope. Check that the voltage waveform on the oscilloscope has a peak-to-peak voltage of 2 volts. Remove the probe from the output of the op amp and place it on the positive lead of the waveform generator. Check that the input voltage waveform is in the order of 0.1 volts peak-to-peak.
Divide 20,000 by 1,000 to obtain 20. Divide 2 volts by 0.1 volts to obtain 20. Change the 20,000-ohm resistor to 10,000 ohms and verify that for a 0.1-volt input signal, the output signal is twice the input signal value; or, in other words, equal to the ratio of the two resistors times the input voltage signal.