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Circuits

Transformer Load Impedance

In the following circuit find Ix and Iy by replacing the transformer and load at points x, x with the transformer load impedance.

Logic Circuit with 3D Flip Flops

Consider the attached circuit. Assume that the three states are initially at the 0 logic level. Which of the given tables is true for the function performed by this circuit? The leftmost column represents the clock pulses. Initially there is no pulse (1st row). As the first clock pulse arrives the resulting change of state is sh

Circuit analysis and resistance

Consider the following circuit. As shown, lossy current source drives 1Kohm load by means of a voltage divider circuit. It is desired to have 5mA flow through the load. R1 and R2 can be assigned any value. Part One: What is the smallest value that R2 can have? Part Two: What is the largest value that R1 can have?

Circuit Analysis with Sinusoidal Source Voltage

Consider the attached circuit. The sinusoidal source voltage is Vs(t)=20sin(2 pi t). The diode is ideal. What would the correct sketch of the source voltage and load voltage look like as a function of time?

Transformers

A 4:1 step-down transformer uses a 60Vac source on the primary windings. There is 120mA flowing through the load resistance on the secondary windings. How do I find the resistive load?

Resistance

How would I find the equivalent resistance R_ab of the following circuit?

RL Circuit Analysis

In the following circuit (see attachment), assume that the switch has been open for a long time, and that it closes at time = 0 seconds. The switch remains closed thereafter. How do I solve for Vx(t) and Ix(t) as shown?

Making a voltage divider

Suppose that you have a 6.0 V battery and you wish to apply a voltage of only 4.0 V. Given an unlimited supply of 1.0 ώ resistors, how could you connect them so as to make a "voltage divider" that produced a 4.0 V output for a 6.0 V input?

Watts, Voltage

A 120 V house circuit (parallel) has the following bulbs and appliances turned on: 25 W, 40 W, 60 W, 900 W and 75 W. Find the equivalent resistance of these bulbs and appliances.

Current Flowing Through a Battery

In the figure attached, R1 = 19 ohms and R2 = 6.3 ohms. What is the current flowing through the battery immediately after the switch is closed, and what is it long after the switch is closed? Pleases see attached for diagram.

Logic Circuit Truth Table

1. Determine the truth table for the following logic circuits. 2. Design a combinational logic circuit to control segment "a" of the 7-segment calculator display. (See attachment for full question.)

Interpretation and Reasoning of Electric Fields

1) If a charge of 8uC is at the top of the y-axis and -1.2uC is at the origin. The distance between the is 3cm. a third charge 7uC is on the x-axis. The distance between the second and third charge is 4cm. find a) the electric field at the center of the triangle. b) The electric pote

Efficiency and power of circuit

The equivalent circuit of Figure P3.57 has Vt = 35 V and Rt = 600 ohms. If the conditions for maximum power transfer exist, determine the value of RL, power of RL, and efficiency of the circuit. See diagram in attached file.

Mesh analysis of circuit

Using mesh analysis, find the voltage gain Av = V2/V1 in the circuit. See attached file for full problem description.

Three Zones of a Single Phase Circuit

Three zones of a single-phase circuit are identified in the figure attached. The zones are connected by two transformers T1 and T2, whose ratings are also shown in the same figure. Using base values of 20kVA and 115 volts in zone-3 calculate the per-unit impedances. Neglect the transformer winding resistances and the shunt admit

Speech Scrambler, Descrambler, Balanced Modulator

A speech scrambler transforms low frequency to high frequency components and vice versa so that a baseband signal of bandwidth B is transformed to another baseband signal of the same bandwidth and a components at the frequency f is transformed into a component at the frequency B-f, where B is the bandwidth of the signal. An exam

Resonant Frequency of a Circuit

Refer to the diagram attached. 1. Calculate the resonant frequency of the circuit 2. Calculate the magnitude of the circuit current at resonance. 3. Calculate the value of VOUT at resonance. 4. Explain why the circuit current is capacitive (i.e. leads the supply voltage) at very low frequencies and inductive at very high fr

Fault Tolerant Volume Control

In a certain application the following circuit serves as a fault tolerant volume control. What value must the potentiometer (P) be in order for the total resistance to be 50ohms? See the attached file.

Virtual Circuits

The following design problem concerning implementation of virtual circuit service. If virtual circuits are used internal to the subnet, each data packet must have a 3-byte header, and each router must tie up 8 bytes of storage for circuit identification. If datagrams are used internally, 15-byte headers are needed, but no router

Question about Electrical Energy Conversion

A 100 kVA, 60 Hz, 7200/480 V, single-phase transformer has the following parameters (all expressed in ohms): RHV = 3.06 RLV = 0.014 XHV = 6.05 XLV = 0.027 Xm,HV = 17,809 Re,HV = 71,400 The transformer supplies a load that draws rated current at 0.75 power factor lagging at 480 V at the load. Sketch the approximate eq

Two power sources in a circuit

I need to find the voltmeter reading and how to deal with 2 power sources Is this going into Thevenins or Kirchoff's? (Please see the attachment.)

Please, show me how you got the answers and give me the answers. Thanks

1. A series RL circuit containing a 0.17-H inductor has a time constant of 0.13 s. What is the resistance in the circuit? 2. A 1000-ohm's resistor is joined in series with a 400-mH inductance and a 12-V battery. (a) What is the time constant of the circuit? (b) How long will it take after the circuit is completed for voltage

Charge flow from one capacitor to another

Why and how does charge flow from one capacitor to another capacitor when the two are connected to each other by a conducting wire? I am not able to understand that; why and how does negative charge flow from a capacitor having lower potential difference between its plates to a capacitor having higher potential difference betwe

Calculating charge of a capacitor and current in a circuit

Hi. Can someone please walk me through how to do the following problem? The capacitor in an RC circuit (R = 120 ohms, C = 45 micro-F) is initially charged. Find (a) the charge on the capacitor and (b) the current in the circuit one time constant after the circuit is connected to a 9.0-V battery." Thank you.

RC Circuit with Expulsion = 12.0 votes

Consider an RC circuit with epsilon = 12.0 V, R = 175 ohms, and C = 55.7 micro-F. Find (a) the time constant for the circuit, (b) the maximum charge on the capacitor, and (c) the initial current in the circuit.