EE 448 Fall 2006 Lab Experiment No. 1 Single Phase AC Circuits

EE 448 Laboratory Experiment 1
Single Phase AC Circuits
2. Observe the voltage waveforms of V s and V r on the oscilloscope and
identify the phase difference between these two voltages.
3. Disconnect only the inductor and measure the phase difference between
V s and V r .
4. Now reconnect the inductor, remove the resistor and measure the phase
difference between V s and V 1 . Does the data from the previous steps
match your calculations for step 4 of part II
5. Connect the circuit as shown in Figure 5.
6. Measure the currents A s , A r and A 1 .
a. Does the data from steps e and f match your calculations from
step 5 of part II
7. Calculate the power delivered to the circuit.
8. Calculate the p.f. of the load.
9. Make the circuit connections as shown in Figure 6. Connect R, L & C in
parallel according to the table given below. First three readings are for
R&L combinations. Last two readings are for R, L & C combinations.
NOTE:
The toggle switches on the inductance, resistance, and capacitive boxes
work as follows. A toggle switch in the down position means that item is
not in the circuit between the two banana plugs. When switched to the
up position, the item is part of the circuit. When two or more toggle
switches are up, those two or more items will be in the circuit connected
in parallel. Depending on whether it’s a resistor, inductor, or capacitor
box will determine the value of the parallel connection.
10. Record your measurements in the table below.
Use V = 120V
I S P R Xi Xc p.f. Q=sin φ
300 j300 -
600 j300 -
1200 j300 -
600 j300 -j300
600 j600 -j300
5