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Transcript

In Problems 1 and 2, find the Thévenin and Norton equivalent circuits with respect to Zload in the circuits below. Please write the values for the sources and equivalent impedances in phasor notation. Note that the values of the components in the circuits are impedances and are written in rectangular coordinates so you do not need a value for angular frequency. 1. There is no solution. DC current source has no path to flow so that the capacitors never reach a finite voltage. 2. ( )‖( ( ( ) ( ) ( ) ) ( ) )‖( ) 3. Find the frequency, f, and angular frequency, , such that the Thévenin equivalent impedance has only a real component. ( So: √ ) 4. For the circuit below, a. Calculate the voltage vR and the current iR and express in phasor notation when Zmatch = (0 + j0). Since Zmatch is equal to 0 and the other component in the branch is a resistor, the current and voltage must be in phase (i.e., the phase angle of vR must equal iR ‖ ‖ ‖ ‖ vR = 1.76 V cos(t + 58.4o) iR = 7.04 mA cos(t + 58.4o) b. Find the impedance for Zmatch that will force the voltage vR to be 180o out of phase with the current iR. In phase is a condition where the phase angle of the voltage is equal to the phase angle of the current. Note that this does not mean that the phase angle will be equal to 0o. This will never occur because the current iR must have the same phase as vR because the current is flowing through a resistor. c. Calculate the voltage vR and the current iR and express in phasor notation when Zmatch is (250 – j400). )‖ ( ( )‖ ‖ ‖ vR = 1 V cos(t + 92.0o) iR = 40 mA cos(t + 92.0o) d. Is more power delivered to the 250 .resistor when Zmatch is equal to zero as compared to when Zmatch is equal to the value in part c? PR = VRIR In part a, PR = 12.4 mW In part c, PR = 40.0 mW