Inductive Circuit Now using frequency generator construct the circuit in Figure
ID: 1641248 • Letter: I
Question
Inductive Circuit Now using frequency generator construct the circuit in Figure 5 using a 120mH inductor and a resistor box set at 830 Ohm. Connect the oscilloscope probes to points A and B as shown. Note that probe A will be measuring the total voltage, while probe B measures only the voltage across the resistor, which will be in phase with the current. Adjust the frequency generator to 75 Hz. Use the oscilloscope to measure the signals at points A and B. Measure the peak-to-peak voltage for each, and record your values. Compute the value V_B/V_A. Adjust the traces on the oscilloscope so that the peaks of the traces are both at the center of the screen. Do the peaks occur at the same time? If not, record the time delay between them. Which is one leading, signal A or signal B? Repeat steps 16 and 17 for the following frequencies: 150Hz, 500 Hz, 1000 Hz, 5000 Hz, 13000 Hz, 40000 Hz. Capacitive Circuit Now, replace the inductor with a 0.15 mu F capacitor and set the resistor box to 830 Ohm. Use the oscilloscope to measure the signals at points A and B. Measure the peak-to-peak voltage for each, and record your values. Compute the value V_B/V_A. Adjust the traces on the oscilloscope so that the peaks of the traces are both at the center of the screen. Do the peaks occur at the same time? If not, record the time delay between them. Which Figure 6 is one leading, signal A or signal B? Repeat steps 20 and 21 for the following frequencies: 150Hz, 500 Hz. 1000 Hz, 5000 Hz, 13000 Hz, 40000 Hz.Explanation / Answer
In part B1,
VA =V= total volatge across RL circuit.
VB = voltage across resistor.
From the voltage triangle,
VB / VA = cos ( phi) = power factor
as phi is the angle between VA and VB.
In part B1,
VA =V= total volatge across RC circuit.
VB = voltage across resistor.
From the voltage triangle,
VB / VA = cos ( phi) = power factor
as phi is the angle between VA and VB