Physic lab 5 series and parallel circuits please h. Resistors in series and parallel physics libretexts. Resistors can be combined in simple circuit arrangements that increase or decrease the overall resistance in the circuit. Lab report series and parallel circuits electrical resistance and. Lab report series and parallel circuits february 19, 2016 shafkat salam lab partners. Metre bridge law of combination of resistors theory. The instructor will specify how to turn in the report. Start this problem by determining the effective resistance of resistors 2, 3, and 4. The object of this lab is to study resistances in series and parallel and to observe and quantify the effect of an ammeter on a circuit.
Compare these theoretical values with the measured values and express them as percentage. Series and parallel resistors in electric circuits youtube. Measure voltage and current for resistors in parallel two 100. How did you observe resistance, current, and voltage relationships in series and parallel combinations. If you understand what we are doing in this experiment, you will be all set to do well on the midterm questions about circuits. Probe around with your mouse, and as you hover over wires and terminals, youll see the calculated currents and voltages. Ohms law and resistors in series and parallel college of san.
To understand the resonance frequency, cutoff frequency, bandwidth and quality factor of a resonance circuit. In this lesson, the student will learn how to simplify parallel and series arrangements of resistors in c. Lab 3 dc circuits and ohms law introduction during the nineteenth century so many advances were made in understanding the electrical nature of matter that it has been called the age of electricity. Series resistance resistors are said to be connected in series when they are connected as in figure 33. Figure 1shows two resistors r1, r2, connected in series in a closed circuit powered by a single battery. Series and parallel resistors goals to understand the fundamental difference between resistors connected in series and in parallel. Examine the circuit diagram to make this assessment. Principles the electrical current i flowing through a device such as a resistor with resistance r is defined as the amount of charge q flowing through the device per unit time.
To compare the current and voltage distribution in parallel and series circuits. Open the dc power supply set up file provided with the lab instructions. Theory in the previous experiment, you constructed 4 circuits, each circuit built with one resistive element. Open the dc power supply set up file provided with the lab. To study the equivalent resistances of two fundamental connections of resistors resistors in series and in parallel. Nov, 2011 load the simulation by clicking open in editor above, and then click simulate at the bottom. This is a very common activity performed in a electricity and magnetism. So for example, in the case of dc, the circuits can also be divided into three groups, such as series dc circuit, parallel dc circuit and series and parallel circuit series dc circuit. In addition, you will measure the resistance of series and parallel combinations of resistors, and compare the results to theoretical calculations based on equations provided. Note that the resistors are connected to each other at two points. In addition, the expected distribution of the voltage and current to each resistor in a network will also be tested. Theories on series and parallel resistors physics forums. In the lab, circuits often contain some devices connected in series, others in parallel.
D cells and current through the circuit in the lab report section. Copy your spreadsheet results and paste them into the document. Theory the measurement results of the potential difference across the resistor r1 and r2. In part 1 of the lab you will be analyzing the very top circuit and then you will work your way down the board for. Our series circuit looked like the one in the sketch below. In the series circuit, we were able to determine that each resistor in the system.
Return the acdc electronics laboratory board to the way it was at the beginning of procedure 1. This can be compared to the theoretical equivalent series resistance of 200 once the resistors were changed to being in parallel, the power was calculated to be 0. Equation 3 known as ohms law, which shows that the constant proportionality relating to the potential difference to the current is called the resistance. Theory resistance in series components of an electrical circuit or electronic circuit.
The method of calculating the circuits equivalent resistance is the same as that for any individual series or parallel circuit. In this experiment, you will construct circuits using multiple resistors. They are said to be in parallel since the voltage across each resistor equals the voltage of the power supply and the resistors provide parallel paths for the current flow. A device which obeys ohms law generally can be described as a. This is from a physics lab report on voltage and current for resistors in series and parallel. You may just need to show the resulting document on the lab computer, or the instructor may also ask for additional analysis, including a more comprehensive lab. Series and parallel circuits series circuits parallel circuits calculating equivalent resistances in series circuits. The voltage drop across the battery vt will be the total sum of the individual drops. First, lets remind ourselves that the effective resistance of resistors in a series is and the effective resistance of resistors in parallel is. To calculate the voltages and currents in simple circuits involving only resistors using the. Wires have resistance that depend on wire size, length, and type of material. Capacitance in series a shows a series connection of three capacitors with a voltage applied. Now, the circuit can be simplified to the following. Sep 20, 2015 resistors in series can be replaced by a single resistor.
This video explains simulation of resistors connected in series in a circuit. As for any capacitor, the capacitance of the combination is related to charge and voltage by. Resistors are in series if the same current must pass sequentially through them. Science 14 lab 3 dc circuits theory all dc circuit analysis the determining of currents, voltages and resistances throughout a circuit can be done with the use of three rules. Series resistors experience the same current, but generally different voltages. You will be building circuits similar to the ones you will be working with in homework and exam problems. The three resistors were more vertically stacked than in a line. Theory the purposes of this experiment are to test ohms law, to study resistors in series and parallel, and to learn the correct use of ammeters and voltmeters. Introduction electricity is an essential part of the modern life experience, and as an engineer it is essential to know how it behaves and responds to changes in its trajectory. In a circuit in parallel, the two resistors are both 51. In part 1 of the lab you will be analyzing the very top circuit. Resistors in series and parallel example no2 find the equivalent resistance, r eq for the following resistor combination circuit. Adjust the power supply until the potential difference across the resistors is 1. Determine whether resistors are in series, parallel, or a combination of both series and parallel.
That is, the three resistors in series could be replaced by a single resistor with a value of rs and the same current i would flow from the battery. Parallel resistance resistors are said to be connected in parallel when connected as in figure 33. Brian lavelle and winston tran abstract the purpose of this lab is to study the flow of current and potential difference across different points in a circuit composed of resistors in series, parallel or a combination of both. Conclusion from the experiment we have done, we can conclude that type of arrangement. This law states that the current in a circuit is directly proportional to the potential. Insert the wires of these leads into the circuit board across the three resistors in series with the two multimeters set to voltage v and current a as shown in the figures 6 and 7. Adding resistors in series always increases the effective resistance. Electrical dc series and parallel circuit electrical4u. The objective of lab also to be familiar with multisim and. In this experiment, we could learn the difference between resistors in series and parallel. Series and parallel resistive circuits physics lab viii objective in the set of experiments, the theoretical expressions used to calculate the total resistance in a combination of resistors will be tested experimentally.
Connect the two resistors on the circuit board that are marked 150 ohms and 700 ohms as shown in figure 6a. Well then explore what happens in series and parallel circuits when you combine different types of components, such as capacitors and inductors. Ohms law iiiresistors in series and parallel v rrr 2 1 2 3 e v 1 v 3 v t i 1 i i t 2 i 3 figure 1. When three different resistors are connected in parallel to a battery whose voltage output is v as in figure 2 in the lab manual. The purpose of this lab is to verify ohms law then to apply ohms law to series parallel circuits and verify the current and voltage rules. In the 1820s, german physicist georg ohm discovered that voltage is equal to the current multiplied by the resistance across any resistor. In order to calculate the current through a given device, redraw the circuit with any resistors in parallel replaced with the equivalent resistance in series, and analyse the resulting series circuit. That is, for a set of parallel resistors, the reciprocal of their equivalent.
To build our parallel circuit, we connected a power supply to three different resistors in parallel using wires and clips. Series and parallel circuits lab report phys 2240 studocu. Experiment 3 resistors in series and in parallel print this page to start your lab report 1 copy print 2 copies of this file data page object. In our previous post about resistors, we studied about different types of resistors. The goal here is to see if we can model resistors in series and parallel as just one single equivalent resistor. Designate the smallest resistance as ri, and consecutively larger. Any electrical circuit can be categorized into three different groups series, parallel and series parallel. Calculating the equivalent resistance of two or more resistors in parallel is a little more complicated than calculating the total resistance of two or more resistors in series. A student in a physics lab mistakenly wired a light bulb, battery, and switch as shown in link. When all the resistive components of a dc circuit are connected end to end to form a single path.
These arrangements are called series and parallel circuits. For one part of the lab we used two 100 ohm resistors in series and measured the following. This experiment should show you the difference between resistors in series and parallel. This experiment demonstrates how current is distributed in resistors connected in series or parallel, and thus describes how to calculate the total effective resistance. Covered in this tutorial what series and parallel circuit configurations look like how passive components act in these configurations. All the resistors follow the basic laws like ohms law and kirchhoffs current law irrespective of their combination and complexity. Series and parallel resistors physics 212 lab the circuit board in front of you has three circuits on it. The objective of this lab is to study circuits with resistors connected in series, parallel, and combination.
A set of resistors are said to be in series when they are connected back to back in a single line. Note in that opposite charges of magnitude flow to either side of the originally uncharged combination of capacitors when the voltage is applied. Resistors in series and parallel combinations electronics post. Not required equipment list qty items part numbers 1 acdc electronics lab em8656 2 d cell 1. This is from a physics lab report on voltage and c. To practice more complicated construction of circuits. Dc circuits analysis laboratory 2011 2012 experiment no. The brightness of the light bulbs in series and parallel. When three different resistors are connected in series with a battery whose voltage output is v. The purposes of this experiment are to test ohms law, to study resistors in. Equivalent resistance of resistors parallel theory. Calculate total resistance of a circuit that contains a mixture of resistors. Resistors in series and parallel resistor combinations.
Three resistors r1, r2, and r3 connected in series. Use the appropriate list of major features for series or parallel connections to solve for the unknowns. Explain why total resistance of a parallel circuit is less than the smallest resistance of any. How to measure dc voltage and current in a parallel resistor. The purpose of this experiment is to explore the relationship between voltage and current in networks of resistors connected in series and in parallel by constructing 6 simple circuits. This is called the law of combination of resistances in series. Resistors in series and parallel resisitors in series the total resistance in the circuit with resistors connected in series is equal to the sum of the individual resistances.
Given two resistors, r1 and r2, in parallel, the equivalent resistance, rt, is. You will also learn theoretical concepts and how to use measuring instruments like voltmeter, ohmmeter etc in this. Ohm discovered that the ratio of voltage to current in a metallic resistor is constant as long as the temperature is held constant. The measurements of voltage and current for one bulb in parallel are the same as the measurements for one bulb in series. Move the voltmeter leads to the spring clips on either side of the first resistor and press the pushbutton switch and record the voltage across the resistor in the lab report section. Resistors in series and parallel connections fau studocu.
Connect two light bulbs to the power supply in series. Dont put the power supply over 3 volts or you will destroy light bulbs. Physic lab 5 series and parallel circuits please help me to correct my lab report and write the conclusion abstract. A resistor network that is a combination of parallel and series connections can be broken up into smaller parts that are either one or the other. To find the imaginary rab that can do the job of the three parallel resistors r1, r2, and r3, it is important to. Dec 30, 2014 in the video i demonstrate how to measure voltage and current in a resistor circuit where the resistors are in parallel. If the starting ends of two resistors are joined to a point and the terminal ends of the two are combined and given connection to a source of electricity,those circuits are called parallel. Resistor circuits that combine series and parallel resistors networks together are generally known as resistor combination or mixed resistor circuits. Oct 07, 2015 resistors in series and parallel combinations. Resistors in series and parallel boundless physics.
In some cases when we do not get the desires or specific resistor values we have to either use variable resistors such as potentiometers or presets to obtain such precise values. While in parallel circuit, the resistor serves as a current divider. Each is connected directly to the voltage source just as if it were all alone, and so the total capacitance in parallel is just the sum of the individual capacitances. Have performed experiment about series and parallel circuit. This is because these three resistors are in series. In series they were connected one after the other, but in parallel, as the name suggests, they are side by side in the circuit. When resistors are in parallel, the current flowing from the battery will come to a junction where it has a choice as to which branch to take. Ohm s law iiiresistors in series and parallel however, all wires that make connections and the connections themselves qualify as series resistance. For voltage source 12 v because in parallel circuit and. Wires add series resistance to circuits, just as good and bad connections add also. Conclusions electrical resistance and conductance resistor.
And we can see the relationship of the resistances, current and voltage in circuit which related to ohms law. Notice the voltmeter has leads in the com and v ports and is connected from one side of the resistors to the other side. Again, at first glance this resistor ladder network may seem a complicated task, but as before it is just a combination of series and parallel resistors connected together. Resistors when set in series and in parallel act differently in terms of carrying current and voltage. If two resistors r 1 and r 2 are connected in series, the currents passing through the two resistors are equal, and the total voltage is equal to the sum of the individual voltages across the. Resistors in series and parallel intro physics lab 2. Physics 215 experiment 11 series and parallel circuits 45 5. To study the behavior of series and parallel lc circuits at resonance. Resistors in series and parallel introduction direct current dc circuits are characterized by the quantities current, voltage and resistance. Laboratory in wave motion, electricity, magnetism and optics phys 2240 uploaded by. Physics 215 experiment 11 series and parallel circuits. Lab 3 circuits lab report series and parallel circuits.
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