Year & Section:
Group no:
Leader:
Members:
Experiment 1:
RMS Values of Voltage and Current
Objective:
1. To investigates the relationship between the peak and rms values of different
periodic signals.
Materials:
1. Function generator (Mode: Sine, Triangular and Rectangular)
2. Oscilloscope (Channel A: 1V/div, Channel B: Off, Time base: 5ms/div, Mode: X/T,
AC, Trigger: Channel A / rising edge / pre-trigger 0%)
3. 100-ohm resistor
4. Voltmeter
5. Ammeter
Procedure:
1. Assemble the circuit as shown in figure 1.
2. Use the function generator as source. (sinusoidal mode)
Figure 1. Circuit Diagram
3. Determine the peak voltage value using oscilloscope and use it to calculate the rms
value. Record the value in Table 1.
4. Close the oscilloscope and open the voltmeter virtual instrument to measure the
RMS value and compute the peak value. Record the results in Table 1.
5. Close the voltmeter and open the ammeter virtual instrument to measure rms and
compute the peak current. Record the results in Table 1.
6. Increase the frequency to 1kHz.
7. Switch the function generator to rectangular mode, then record the results in Table 2.
8. Switch the function generator to triangular mode, then record the results in Table 3.
Note: refer to this for formulas converting rms to peak or vice versa for sinusoidal, triangular and
square wave.
https://wp.optics.arizona.edu/mnofziger/wp-content/uploads/sites/31/2016/08/AVG-and-RMS-Val
ues-of-Periodic-Waveforms-2012.pdf
Data and result:
Table 1. Peak and rms value of the given circuit using different instrument [sinusoidal].
Instrument
Peak
100 Hz
Rms
1k Hz
100 Hz
1k Hz
Oscilloscope
Voltmeter
Ammeter
Table 2. Peak and rms value of the given circuit using different instrument [Rectangular].
Instrument
Peak
100 Hz
Rms
1k Hz
100 Hz
1k Hz
Oscilloscope
Voltmeter
Ammeter
Table 3. Peak and rms value of the given circuit using different instrument [Triangular].
Instrument
Peak
100 Hz
Oscilloscope
Voltmeter
Ammeter
Rms
1k Hz
100 Hz
1k Hz
Observations:
Question:
1. What are the relationships between the peak and rms values of the voltage and
current?
2. After increasing the frequency what do you observe?
3. After changing the periodic signals what do you observe on the value of peak and
rms?
Conclusion:
APPENDICES:
APPENDIX A: THEORETICAL COMPUTATIONS
APPENDIX B: SIMULATED CIRCUIT
APPENDIX C: MEETING OF THE GROUP WHILE WORKING WITH THE
EXPERIMENT (PICTURE- MEETING)