For this experiment, you will need a power supply which can provide
+10 volts, -10 volts and a common ground. However, the power supply at your station
is not equipped to provide both positive and negative 10 volts relative
to earth ground. So we are going to ``trick" the op-amp circuit by a
clever use of a single power supply.
Assemble the circuit shown in Figure 
.
From the standpoint of the bench (20 V)
power supply, 
is ground, common is 10 volts and 
is
20 volts. However, from the standpoint of the op-amp, common will be used
as ground (not the same as earth ground)
so that 
is now only 10 volts and 
is -10 volts.
We have switched reference
frames so that 
is now only 10 volts and 
is -10 volts.
Measure and record the values of 
and 
using common as the reference (ground) node.