Ac Electrical Circuits
Laboratory 4
AC ELECTRICAL CIRCUITS
AIMS
The aims of this laboratory are to:
• Understand the characteristics of AC voltage waveforms
• Construct a simple AC circuit
• Become familiar with the use of an oscilloscope used for measuring and analysing AC voltage signals
• Understand the principle of electromagnetism and observe electromagnetic induction
RESULTS AND CALCULATIONS
1. CRO Demonstration and simulation
• Measure the peak-to-peak ( ), period (T) and frequency (f) of the waveform (be sure to adjust the voltage and time scales to optimise your reading of the number of squares in the x- and ¬y- directions). To measure ( ), period T and f:
( ) = number of squares from peak-to-peak (y-direction) x voltage scale
T = number of squares for 1 cycle (x-direction) x time scale
f = 1/T
( ) = scale x no. of squares (same for period)
0.5V/div x 4 = 2V confirmed.
2. Constructing and analysing a simple AC circuit
• Connect the FG output to the 2 k resistor to construct the AC circuit in Figure 1.
Figure 1: Simple AC circuit with the power supply set to 2V peak-to-peak, frequency set to 1,000 Hz and a 2000 resistor.
• Measure ( ), T and f for the displayed waveform (being sure to use optimal voltage and time scales on the CRO). Do your measured results agree with their expected values?
The measured results agree with their expected values.
• Measure the AC rms current in the circuit with the DMM. Does your result agree with the experimentally expected current?
Our result agrees with the experimentally expected current as shown below:
3. Electromagnetism
• Move the compass around the...
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