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From Circuit Analysis For Dummies. When doing circuit analysis, you need to know some essential laws, electrical quantities, relationships, and theorems. You can also do the same type of calculation to obtain the equivalent capacitance and inductance for a network of capacitors or inductors.

For more complicated circuits, the node-voltage analysis and mesh current techniques come in handy. At the most basic level, analyzing circuits involves calculating the current and voltage for a particular device. Device equations describe the relationship between voltage and current for a specific device. The following table can help you keep this information straight.

When analyzing circuits, you can simplify networks consisting of only resistors, capacitors, or inductors by replacing them with one equivalent device.

### CHEAT SHEET

The following equations show equivalent series and parallel connections for resistor-only, capacitor-only, and inductor-only combinations. When dealing with complicated circuits, such as circuits with many loops and many nodes, you can use a few tricks to simplify the analysis. The following circuit analysis techniques come in handy when you want to find the voltage or current for a specific device.

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Node-voltage analysis: Nodes are particular points in a circuit. When many devices are connected to a particular point, you can make this node a reference node and think of it as having a voltage of 0 V. You then use it as a reference point to measure voltage for a particular node. Mesh-current analysis: A mesh is a loop with no devices enclosed by the loop, where the mesh boundaries are those devices that form the loop.

Mesh equations are KVL equations with unknown mesh currents as variables. After finding mesh currents, you use i — v relationships to find device voltages. Superposition: For linear circuits with independent sources, you can use superposition to find the voltage and current output for a particular device. Superposition involves turning on sources one at a time while turning off the other sources.

You turn off a current source by replacing it with an open circuit, and you turn off a voltage source by replacing it with a short circuit. To get the total output, you calculate the algebraic sum of individual contributions due to each source. The equivalent circuits will hold for all loads including open and short circuit loads if they have the same voltage and current relationships across the terminals. The two equivalents are related to each other by a source transformation.You all must have this kind of questions in your mind.

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The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. Hottest Questions. Previously Viewed. Unanswered Questions. Electrical Engineering. Wiki User Motor Circuit Analysis MCA is to ascertain the health of the motor on-line, and is accomplished through detection of electrical imbalance and degradation, resulted with shortened motor life and unsafe operation.

It consists of on-line current and voltage analyses as well as off-line insulation, induction, and capacitance measurements. Robert L. Asked in Electronics Engineering What is mesh analysis? Mesh analysis is a method to solve a circuit. For non planer circuit nodal analysis can help to determine current or voltage. Mesh analysis reduces the equations to get current. A motor in a circuit is classed as the circuit's load.

In the circuit where the DC motor is added, it was not specified whether the motor was added in series or in parallel to circuit elements.

### CHEAT SHEET

If it was added in series, it will increase circuit resistance and it will cause circuit current to go down. In parallel, the motor will reduce total circuit resistance, and circuit current will increase. There is no need to write a C program for circuit analysis; there are lots of packages out there that already do that for example, Spice.

Asked in Electrical Engineering What is the circuit for reversing an electric motor?You have done well to get to this point. This is your chance to test just how well you are doing. Remember that you set your pace, in your Open-Learning. Here are some pointers to answering this test. Please read them carefully before attempting the questions.

Can't understand a specific question? Click here to ask for help. Why do we say the "voltage across" or "the voltage with respect to? If you plot voltage vs.

A resistor is on for 5 seconds. It consumes power at a rate of 5 watts. How many joules are used? A 1 ohm resistor has 5 volts DC across its terminals. What is the current I and the power consumed? The voltage across two resistors in series is 10 volts. One resistor is twice as large as the other. What is the voltage across the larger resistor?

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Which of the following is a defined quantity? Which of the following is a correct relation? The algebraic sign of power depends on movement of charge through the drop and rise of voltage.

Explanation: Passive element means it could not generate electricity. Which of the above is valid? The above circuit is valid. Dependent source supplies voltage across the same pair of terminals and an ideal current source supplies same current regardless of voltage, similarly an ideal voltage source supplies same voltage irrespective of current, so this is an allowable connection.

The opposing capacity of materials against the current flow is a Conductance b Inductance c Susceptance d Resistance View Answer Answer: d Explanation: The opposing capacity of materials against the current flow is resistance. The current passing through a circuit is 7. KCL is based on the fact that a There is a possibility for a node to store energy. View Answer Answer: b Explanation: Since the node is not a circuit element, any charge which enters node must leave immediately.

Calculate potential difference between x and y a 4. Find R a Determine currents I1I2 and I3. Solve for I. Find i0 and v0 in the above circuit. So, calculation these two gives the required current value. In a VCIS which is the controlled source and which one is the dependent source?

In an ICVS which is the controlled source and which one is the dependent source? What is the other name for Dependent sources? The analysis of a circuit containing dependent sources can be done using nodal and mesh analysis.

Where voltage division problem arises a Series connected resistors b Parallel connected resistors c When resistors are equal d Both series and parallel resistors.

View Answer Answer: a Explanation: In series, voltage is the difference and current same. Where current division problem arises a Series connected resistors b Parallel connected resistors c When resistors are equal d Both series and parallel resistors. Answer: b Explanation: In parallel voltage is same and current is the difference. For a parallel connected resistor R1, R2 and a voltage of V volts. Voltage division is necessary for parallel resistance networks a True b False View Answer Answer: b Explanation: In parallel, connection voltage is same so no division is required.

Why is current division necessary? View Answer Answer: b Explanation: In parallel current differs. So Ammeter is placed in series and is used to measure current. Continuous voltages or current signals are measured using a Tachometers b Sonometers c Analog meters d Digital meters View Answer Answer: d Explanation: Digital meters are used to measure current or voltage signals at discrete points in time known as sampling times.

## Electric Circuit Analysis/Circuit Analysis Quiz 1

Digital meters are preferable than analog meters. Determine RA.

So acts as an open circuit. So acts a short circuit.Skip to content. Solving a Simple Circuit of Three Elements - A simple circuit is solved and power absorbed or supplied by each element is determined. KCL as well as Ohm's law are used in solving the circuit. It is shown and discussed how a source, here current source, can be neither absorbing or supplying power. Power and Energy Conservation - A circuit with two sources and three two port elements is studied.

Some voltages and currents are given. Voltage of the voltage source is unknown. We need to analyze the circuit, find power of other elements and use the energy conservation to determine the power of the voltage source.

Circuit Containing Only Sources - We go through solving a circuit which only containes independent sources: two voltage sources and two current sources. Problem Using Voltage Sources to Determine Node Voltages - A three-node circuit is solved by using the voltage of voltage sources. The nodal analysis is not used since there are enough voltage sources to determine all node voltages.

The circuit has an independent current source and a dependent voltage s. The solution is explained step-by-step. Solve Using Current Division Rule - A DC resistive circuit with two sources, one voltage source, one current source both independent solved using current division method.

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Voltage Divider - Voltage Division Rule - Voltage Division Rule: The voltage is divided between two series resistors in direct proportion to their resistance. This simple rule can be used in solving simple circuits or in simplifying the solution of complicated ones.

In this post, the voltage divider circuit is studied and some examples are solved to show how this rule can be deployed in solving circuits.

## Electric Circuit Analysis/Circuit Analysis Quiz 1

Problem Voltage Divider - In this solved problem, four circuits are solved using voltage divider the voltage division rule. Problems are arranged from simple ones to more challenging ones. It is shown how voltage divider can be used to solve simple problems. Problem Circuit Reduction - Current Divider - Solving a circuit by using circuit reduction and current divider methods. Problem Power of a Current Source - A simple DC resistive circuit is solved by circuit reduction for series and parallel resistors and the power a current source calculated.

Find the current using superposition. Superposition method - Circuit with two sources - Finding current by using superposition method.

There are two independent sources, so we need to turn them off one by one and calculate their contributions. Superposition Method - Circuit With Dependent Sources - A circuit with two independent and two dependent sources is solved by the superposition method. Independent sources are turned off one at a time and the contribution of the on source is calculated.

Dependent sources should not be turned off. Superposition Problem with Four Voltage and Current Sources - A circuit with two voltage sources and two current sources is solved by the superposition method. The contribution of each source is calculated individually and the response is found by adding the contributions.

Mesh Current Analysis Problem - A circuit with four meshes solved using the mesh analysis. The circuit has two current sources, one voltage source and six resistors.

Mesh Analysis - Supermesh - The mesh analysis used to solve the circuit which has a supermesh.

Kirchhoff's Law, Junction & Loop Rule, Ohm's Law - KCl & KVl Circuit Analysis - Physics

After solving the circuit, power of sources determined. It contains one dependent voltage source, two independent voltage sources, two independent current sources and some resistors. The dependent causes two nodes to form a supernode.Electrical A2Z.

The formulation covers the general case of three types of the load being present in a circuit. If any of the components is absent usually, the inductor or the capacitor, not the resistorthen in calculations, the corresponding value for that element can be set to zero or the associated term deleted from the formulae.

Note that the order the three components are shown is not important. In tackling the circuit at hand, we need to know the relationship between the applied voltage and the current and the power consumption of the circuit, using all the knowledge that has been gained so far. The applied voltage in this circuit is divided between the three components. Recall that each of these voltages follows the rules that we learned about the relationship between current and voltage in each component.

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That is. Nevertheless, remember that the scale for current and voltage can be different, whereas the scale for all identical values voltages here must be the same.

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Using the Pythagorean Theorem the value of the impedance Z can be written as. If the source voltage and frequency are 12 V and 60 Hz, respectively, what is the current in the circuit?

These voltages are not in phase with each other and, hence, can only be added as vectors. It is also easy to understand if the circuit is more inductive or more capacitive. If the source frequency is 50 Hz, and the circuit current is mA, what is the applied voltage?

The distribution of this voltage among the three components is as follows:. In the current case, when the applied voltage is 12 V i. As a result, all voltages will be 0. The voltage across the capacitor, therefore, is.

You see that it is not necessary always to do repeat all the calculation. Also, note that the voltage across the capacitor is larger than the applied voltage of 12 V. This is always possible, and we do not expect all the voltages to be smaller than the applied voltage. What is the voltage across the capacitor? The other value is negative and is not acceptable. Want create site? Find Free WordPress Themes and plugins. Did you find apk for android? You can find new Free Android Games and apps.