Investigation of Electric Oscillation of RL and RLC Circuits

EXPERIMENT 3 
Investigation of Electric Oscillation of RL and RLC Circuits 
Equipment and Materials 
Science Workshop 750 Interface 
Power Amplifier 
Lab circuit board with available inductor coil 
Iron rod for coil core 
Capacitor of 10 μF 
Objectives 
Understanding the current across an inductor-resistor and the RLC circuits, then calculate the 
energy of the oscillation RLC circuit. 
 How to process the experimental results 
Part 1. Resistance and Inductance of the Coil 
Question 1: Measure and calculate the resistance RL of your coil L. 
Question 2: Calculate the inductance of your coil with and without the iron core based on the value 
of slope obtained by Datastudio software. 
Coil inductance without core: Lw/o = mH 
Coil inductance with core: Lw = mH 
Part 2: Free Oscillations of the RLC circuit 
Question 3: Calculate the frequency, fmeasured = 1/T (Hz) based on the period of oscillation 
determined by tools of Datastudio software. 
Question 4: For your circuit parameters, compute the expected value of 
LC
f prediction π2
1= (Hz) 
and compare it to your measured value. Do you expect your result to be greater, equal, or less than 
the measured value (Δf = prediction − fmeasured )? 
Part 3: Observe the Energy in the RLC Circuit 
Question 5: The circuit is losing energy most rapidly at times when the graph of total energy is 
steepest; these times occur at about the same times that the magnetic energy reaches a local 
maximum. Briefly explain why.