# Parallel Circuit Questions And Answers Pdf 2 754

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Published: 04.05.2021  Two elements are in parallel if they are connected between the same pair of notes. If each element is in parallel with every other element, it is called a parallel circuit.

The meter movement itself can handle up to 1 mA. The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is A.

## Series And Parallel Circuits Questions And Answers

In this circuit, three resistors receive the same amount of voltage 24 volts from a single source. The answers to this question may seem paradoxical to students: the lowest value of resistor dissipates the greatest power. Math does not lie, though. Challenge your students to recognize any mathematical patterns in the respective currents and power dissipations.

What will happen to the brightness of the light bulb if the switch in this circuit is suddenly closed? This question illustrates a disparity between the ideal conditions generally assumed for theoretical calculations, and those conditions encountered in real life. Truly, it is the purpose of a voltage source to maintain a constant output voltage regardless of load current drawn from it , but in real life this is nearly impossible. All we can say is that theoretically there will be no effect from closing the switch, but that in real life there will be some degree of dimming when the switch is closed.

Learning to mathematically analyze circuits requires much study and practice. Typically, students practice by working through lots of sample problems and checking their answers against those provided by the textbook or the instructor. While this is good, there is a much better way.

For successful circuit-building exercises, follow these steps:. One way you can save time and reduce the possibility of error is to begin with a very simple circuit and incrementally add components to increase its complexity after each analysis, rather than building a whole new circuit for each practice problem. Another time-saving technique is to re-use the same components in a variety of different circuit configurations. It has been my experience that students require much practice with circuit analysis to become proficient.

To this end, instructors usually provide their students with lots of practice problems to work through, and provide answers for students to check their work against. While this approach makes students proficient in circuit theory, it fails to fully educate them.

They also need real, hands-on practice building circuits and using test equipment. Another reason for following this method of practice is to teach students scientific method : the process of testing a hypothesis in this case, mathematical predictions by performing a real experiment. Students will also develop real troubleshooting skills as they occasionally make circuit construction errors. Discuss these issues with your students in the same Socratic manner you would normally discuss the worksheet questions, rather than simply telling them what they should and should not do.

I never cease to be amazed at how poorly students grasp instructions when presented in a typical lecture instructor monologue format! If your students will be working with real circuits, then they should learn on real circuits whenever possible. If your goal is to educate theoretical physicists, then stick with abstract analysis, by all means! But most of us plan for our students to do something in the real world with the education we give them.

In most sciences, realistic experiments are much more difficult and expensive to set up than electrical circuits. Nuclear physics, biology, geology, and chemistry professors would just love to be able to have their students apply advanced mathematics to real experiments posing no safety hazard and costing less than a textbook. Exploit the convenience inherent to your science, and get those students of yours practicing their math on lots of real circuits!

The equation for calculating total resistance in a parallel circuit for any number of parallel resistances is sometimes written like this:. Manipulate this equation to solve for resistor value R 1 , given the values of R 2 and R parallel :. The formula for calculating total resistance of three parallel-connected resistors is as follows:.

Algebraically manipulate this equation to solve for one of the parallel resistances R 1 in terms of the other two parallel resistances R 2 and R 3 and the total resistance R. In other words, write a formula that solves for R 1 in terms of all the other variables. This question is nothing more than practice algebraically manipulating equations. Ask your students to show you how they solved it, and how the two given answers are equivalent.

Identify which of these circuits is a parallel circuit there may be more than one shown! Some students may have difficulty distinguishing that circuit E is a parallel circuit, but it is! Once they see that there is no difference as far as voltage is concerned between the top of one resistor, the top of the other, or the top of the battery and likewise for all the bottom connections , it should become clearly evident why voltage must be equal across these three components. Follow-up question: how much total current does the battery supply to the circuit, given these individual resistor currents?

A key element to this question is the plotting of currents. Students need to see how individual resistor currents graphically relate to the total source current in a parallel circuit, because this has direct bearing on the calculation of total current, and also to an understanding of total resistance in parallel circuits.

Qualitatively compare the voltage and current for each of the three light bulbs in this circuit assume the three light bulbs are absolutely identical :. The voltage dropped across each of the lights bulbs is guaranteed to be equal.

The current through each of the light bulbs, in this particular case with identical bulbs , happens to be equal. Here, the important principles of voltage and current in a parallel circuit are highlighted.

An important lesson of this question is the distinction between measurements which are guaranteed to be equal versus measurements which just happen to be equal for a given selection of components. How much electrical resistance would you expect an ohmmeter to indicate if it were connected across the combination of these two parallel-connected resistors? Explain the reasoning behind your answer, and try to formulate a generalization for all combinations of parallel resistances. Follow-up question: how much resistance would you expect the ohmmeter to register if there were three similarly-sized resistors connected in parallel instead of two?

What if there were four resistors? The concept of parallel total resistance, in relation to individual resistances, often confuses new students. Be sure to allow plenty of discussion time to work through the conceptual difficulties with them. There are two well-known formulae for calculating the total resistance of parallel-connected resistances. One of these works only for two resistances, while the other works for any number of parallel resistances. Write these two formulae, and give examples of their use.

Although I typically use the lower formula exclusively in my teaching, the upper formula is often useful for situations where a calculator is not handy, and you must estimate parallel resistance.

A quantity often useful in electric circuit analysis is conductance , defined as the reciprocal of resistance:. In a series circuit, resistance increases and conductance decreases with the addition of more resistors:.

Describe what happens to total resistance and total conductance with the addition of parallel resistors:. When successive resistors are connected in parallel, total resistance decreases while total conductance increases. Follow-up question: what is the exact formula that describes total conductance in a network of parallel conductances?

Explain, step by step, how to calculate the amount of current I that will go through each resistor in this parallel circuit, and also the voltage V dropped by each resistor:. Follow-up question: trace the direction of current through all three resistors as well as the power supply battery symbol. Compare these directions with the polarity of their shared voltage.

Students often just want to memorize a procedure for determining answers to questions like these. Challenge your students to not only understand the procedure, but to also explain why it must be followed. Something your students will come to realize in discussion is that there is more than one way to arrive at all the answers!

While some of the steps will be common to all calculation strategies, other steps near the end leave room for creativity. Discuss with your students what a good procedure might be for calculating the unknown values in this problem, and also how they might check their work.

In a parallel circuit, certain general rules may be stated with regard to quantities of voltage, current, resistance, and power. Express these rules, using your own words:. Rules of series and parallel circuits are very important for students to comprehend. However, a trend I have noticed in many students is the habit of memorizing rather than understanding these rules.

Students will work hard to memorize the rules without really comprehending why the rules are true, and therefore often fail to recall or apply the rules properly. An illustrative technique I have found very useful is to have students create their own example circuits in which to test these rules. Simple series and parallel circuits pose little challenge to construct, and therefore serve as excellent learning tools.

What could be better, or more authoritative, than learning principles of circuits from real experiments? This is known as primary research , and it constitutes the foundation of scientific inquiry. The greatest problem you will have as an instructor is encouraging your students to take the initiative to build these demonstration circuits on their own, because they are so used to having teachers simply tell them how things work.

This is a shame, and it reflects poorly on the state of modern education. What will happen in this circuit as the switches are sequentially turned on, starting with switch number 1 and ending with switch number 3?

As the first switch SW1 is closed, the voltage across resistor R1 will increase to full battery voltage, while the voltages across the remaining resistors will remain unchanged from their previous values.

The amount of current drawn from the battery will increase. But I digress. The circuit shown here is commonly referred to as a current divider. How much current is drawn from the battery in this circuit? How does this figure relate to the individual resistor currents, and to the total resistance value? Some students may find the diagram hard to follow, and so they will find the task of analysis helped by drawing an equivalent schematic diagram for this circuit, with all terminal points labeled.

I recommend you not suggest this solution immediately, but rather challenge your students to think of problem-solving techniques on their own. Surely, someone in the class will have thought of doing this, and the impact of such a suggestion coming from a peer is greater than if it came from you, the instructor.

There is a simple equation that gives the equivalent resistance of two resistances connected in parallel. Write this equation. Secondly, apply this two-resistance equation to the solution for total resistance in this three-resistor network:. There is a way to apply a two-resistance equation to solve for three resistances connected in parallel. Examine this modified version of the original schematic diagram:.

And who said technological work never involves creativity? This question challenges students to apply an equation to a problem that it is not ideally suited for. The basic principle used in the solution of the problem is very practical.

It involves the substitution of an equivalent component value in place of multiple components, which is a problem-solving technique widely applied in electrical network analysis, as well as other forms of mathematical analysis. ## 300+ TOP PARALLEL CIRCUITS Questions and Answers Pdf

Total power in a parallel circuit is the sum of the power consumed on the individual branches. Chapter 07 Series-Parallel Circuits Source And now c we are left with R in parallel with R 3. What would happen if they were wired in series? Some circuits include both series and parallel parts. ## Electronics - Parallel Circuits

Time limit: 0 Quiz-summary 0 of 8 questions completed. You have to finish following quiz, to start this quiz:. You have reached 0 of 0 points, 0. In Series Circuit, which of the following quantity remains same through out the circuit:. Which of the following quantity remains in parallel circuit:. In this circuit, three resistors receive the same amount of voltage 24 volts from a single source.

### 300+ TOP PARALLEL CIRCUITS Questions and Answers Pdf

Refer to Figure 5 A. The terms series circuit and parallel circuit are sometimes used, but only the simplest of circuits are entirely one type or the other. About the worksheets This booklet contains the worksheets that you will be using in the discussion section of your course. Select a circuit. For this sentence the form of the words is present tense verb. Key Stage 3 worksheet on series and parallel circuits.

In this circuit, three resistors receive the same amount of voltage 24 volts from a single source. The answers to this question may seem paradoxical to students: the lowest value of resistor dissipates the greatest power. Math does not lie, though. Challenge your students to recognize any mathematical patterns in the respective currents and power dissipations. What will happen to the brightness of the light bulb if the switch in this circuit is suddenly closed? Learn magnetic effect and electric current, uses of electromagnets, fuses and circuit breakers, current and energy, series and parallel circuits test prep for online elementary school courses. Free science student portal for online learning electrical circuits and electric currents quiz questions for online courses. MCQ : In series circuit electrons in the current when comes to second bulb after passing through the first, have. Science MCQs. Grade 7 Science. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries. View Answer.

Solved examples with detailed answer description, explanation are given and it would be easy to understand. Here you can find objective type Electronics Parallel Circuits questions and answers for interview and entrance examination. Multiple choice and true or false type questions are also provided. You can easily solve all kind of Electronics questions based on Parallel Circuits by practicing the objective type exercises given below, also get shortcut methods to solve Electronics Parallel Circuits problems. What is the total power loss if 2 k and 1 k parallel-connected resistors have an I T of 3 mA?

Differentiate between creepers and climbers. If the circuit is not series RLC or parallel RLC determine the describing equation of capacitor voltage or inductor current. Induction Machine.

Solved examples with detailed answer description, explanation are given and it would be easy to understand. Here you can find objective type Electronics Series-Parallel Circuits questions and answers for interview and entrance examination. Multiple choice and true or false type questions are also provided. You can easily solve all kind of Electronics questions based on Series-Parallel Circuits by practicing the objective type exercises given below, also get shortcut methods to solve Electronics Series-Parallel Circuits problems.

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