Loading...

Messages

Proposals

Stuck in your homework and missing deadline? Get urgent help in $10/Page with 24 hours deadline

Get Urgent Writing Help In Your Essays, Assignments, Homeworks, Dissertation, Thesis Or Coursework & Achieve A+ Grades.

Privacy Guaranteed - 100% Plagiarism Free Writing - Free Turnitin Report - Professional And Experienced Writers - 24/7 Online Support

Power in dc circuits lab report

25/10/2021 Client: muhammad11 Deadline: 2 Day

Physics "DC Circuits" Lab Report

Direct Current (DC) Circuits Introduction In this lab, we will get acquainted with various components of electrical circuits. We will learn: how to make simple circuits using a battery (or power supply), light bulbs, resistors; draw the circuit diagram; how to use color code to read the resistance of the resistor; how to use the measuring tools like a digital multimeter – DMM; how to connect the DMM to measure the resistance, voltage and current. We will learn how to simplify the circuit by replacing the circuit diagram with an equivalent one. Text reference: Young and Freedman §§ 26.1, 26.3. We will investigate the behavior of direct current (DC) electrical circuits. We will study the flow of electrical current in a circuit from the battery or power supply, through the wires, and through various combinations of light bulbs and/or resistors.

A simple electrical circuit usually has a power (energy) source such as a battery or power supply and resistors such as a light bulb or a carbon resistor. Here are the symbols for some electrical components you may see in circuit diagrams of the lab manuals of this lab course:

A closed circuit is a path along which current carriers (electrons in conductors) can flow. Current does not flow in an open circuit. A circuit in which there is a single pathway is known as a series circuit whereas a circuit that has multiple (more than one) possible paths is known as a parallel circuit. Resistors impede the flow of current in a circuit. We assume that connecting leads (conductors) have negligible resistance, while the insulators have very large resistance. Many resistors obey Ohm’s Law (V = IR), which states that the current I through a resistance R is proportional to the voltage V across the resistor. We will study Ohm’s law in the next lab class experiment. Part 1. Light Bulbs

1. Simple circuit Make a simple circuit using a battery or DC power supply, a light bulb (in its holder), and some of the connecting leads.

a) What happens to the light bulb when you close the circuit? ___________________________________________________________________

b) Draw a circuit diagram representing your circuit using the symbols from above: Try to remember how brightly the bulb is shining in step 1.

Page 2 of 4

2. Light bulbs in Series Now add a second identical bulb in series (you will need to disconnect your circuit first).

a) Draw a proper diagram representing your circuit. What do you observe about the light intensity (brightness) in each bulb compared to a single bulb in the previous step? __________________________________________________________________

b) What happens if you remove one of the light bulbs from its holder? _________________________________________________________________

3. Light bulbs in Parallel Disconnect the circuit from step 2 and add the second bulb in parallel to the first.

a) Draw a proper diagram representing your circuit. What do you observe about the light intensity in each bulb compared to a single bulb in step 1?

__________________________________________________________________ b) What happens if you remove one of the light bulbs from its holder? __________________________________________________________________

Part 2. Resistors

The Carbon Resistors A common type of resistor used in electrical circuits is made from a carbon composition in the form of a small solid cylinder with a wire lead attached to each end. The nominal resistance value is specified by a color code as it is shown for example in Figure 1.

Figure 1. Carbon resistor with 4 color band

The first three bands give the resistance in ohms in the form R = AB x 10C Ohms, where A, B, and C are integers between 0 and 9. The first band is A, the second B and the third C. The color code for the integer is:

black brown red orange yellow green blue violet grey white 0 1 2 3 4 5 6 7 8 9

The fourth band specifies the tolerance, i.e. the allowed deviation from the nominal value, according to

gold silver no band 5% 10% 20%

The resistance of the resistor shown in Figure 1 (with the color bands: A-orange, B-blue, C-brown and D-gold) according to the color code is: R = (36 x 101 ± 5%) Ohms = (360 ± 5%) Ohms = (360 ± 18) Ohms. Define the resistances of the resistors R1; R2; R3 you have at your station using the color code and compare them with the direct measured values using DMM (digital multimeter) as an ohmmeter (the dial - at Ω (Ohm) position).

Page 3 of 4

Resistors connected in series and in parallel are shown in Figure 2.

Figure 2a) Resistors in series

Figure 2b) Resistors in parallel

1. Simple circuit

Make a circuit by replacing the light bulb in step 1 in Part 1 with the resistor R1. Use the DMMs to measure the voltage across the resistor and the current passing through it. In order to measure the voltage across a resistor the DMM (voltmeter option - the dial is on DC V position) must be connected in parallel to the resistor by connecting the two probes on either side of the resistor. In order to measure the current through a resistor, the DMM (ammeter option - the dial is on DC A position) must be connected in series so that it is part of the current path. Show your connection to your TA before closing the switch. In Figure 3 the voltmeter is connected in parallel to the light bulb, while the ammeter is connected in series.

Figure 3. Connecting the voltmeter and ammeter in circuit.

In both cases connect the red terminal R of the DMM to the high potential point (which is closer to the positive terminal of the power source) and the COM (black) terminal B of the DMM to the low potential point. Otherwise you will see a negative reading on the DMM display.

2. Resistors in series Measure the resistances of two resistors R1 and R2 using DMM’s as an ohmmeter. Connect two resistors in series and make a circuit by connecting them with the power source.

a) Draw a proper diagram representing your new circuit. Measure the current in circuit, current through each resistor and voltage drop on each resistor.

b) What can you say about the currents and voltages? c) Do the current values through the resistors differ? Explain why? d) Do the values of the voltage drop across the resistors differ? e) Are these relations Vj = Ij·Rj correct for each resistor? f) How is the sum of the voltage drops across the resistors related to the voltage of the

battery or the power supply?

Page 4 of 4

On the basis of your measurements can you conclude that the total resistance Rt of two resistors R1 and R2 connected in series is given by the equation: Rt = R1 + R2?

Hint: Vt = V1 + V2 or It·Rt = I1·R1 + I2·R2. Measure the effective resistance Rt using the DMM and compare with the sum of the measured R1 and R2. Does Rt = R1 + R2?

3. Resistors in parallel Connect two resistors in parallel and make a circuit with them connected with the power source.

a) Draw a proper diagram representing your new circuit. Measure the total current in the circuit, the current through each resistor (you will need to disconnect one end of the resistors to connect the DMM as an ammeter), and the voltage drop on each resistor.

b) What can you say about the currents and voltages? c) Do the current values through the resistors differ? d) Do the values of the voltage drop across the resistors differ? e) Are these relations Vj = Ij·Rj correct for each resistor? f) How is the sum of the currents trough the resistors related to the total current in the

circuit? On the basis of your measurements can you conclude that the total resistance Rt of two resistors R1 and R2 connected in parallel is given by the equation: 1/Rt = 1/R1 + 1/R2?

Hint: It = I1 + I2 or Vt/Rt = V1/R1 + V2/R2. Measure the effective resistance Rt using the DMM. Does 1/Rt = 1/R1 + 1/R2. Part 3 Connect the resistors as shown in Figure 4 (combination of series and parallel connection). Calculate the total resistances RAB for the diagram shown below. Show your calculations.

a)

equivalent to

b)

Figure 4. The equivalent diagrams.

On the diagram b) the resistor R1 is connected in series with R23 which is the effective resistance of two resistors R2 and R3 connected in parallel on diagram a). Measure the total resistance RAB using the DMM as an ohmmeter and compare your calculated and measured values of total resistances. Self-assessment questions: 1. How do we connect an ammeter in a circuit (in parallel or in series)? 2. How do we connect a voltmeter in a circuit (in parallel or in series)? 3. How can you calculate the equivalent resistance for resistors connected in series? 4. How can you calculate the equivalent resistance for resistors connected in parallel?

Part 1. Light Bulbs
Part 2. Resistors

Homework is Completed By:

Writer Writer Name Amount Client Comments & Rating
Instant Homework Helper

ONLINE

Instant Homework Helper

$36

She helped me in last minute in a very reasonable price. She is a lifesaver, I got A+ grade in my homework, I will surely hire her again for my next assignments, Thumbs Up!

Order & Get This Solution Within 3 Hours in $25/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 3 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 6 Hours in $20/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 6 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 12 Hours in $15/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 12 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

6 writers have sent their proposals to do this homework:

Top Essay Tutor
Academic Master
Top Writing Guru
University Coursework Help
Top Quality Assignments
Finance Professor
Writer Writer Name Offer Chat
Top Essay Tutor

ONLINE

Top Essay Tutor

As per my knowledge I can assist you in writing a perfect Planning, Marketing Research, Business Pitches, Business Proposals, Business Feasibility Reports and Content within your given deadline and budget.

$42 Chat With Writer
Academic Master

ONLINE

Academic Master

I am an academic and research writer with having an MBA degree in business and finance. I have written many business reports on several topics and am well aware of all academic referencing styles.

$47 Chat With Writer
Top Writing Guru

ONLINE

Top Writing Guru

I am an experienced researcher here with master education. After reading your posting, I feel, you need an expert research writer to complete your project.Thank You

$43 Chat With Writer
University Coursework Help

ONLINE

University Coursework Help

I am a PhD writer with 10 years of experience. I will be delivering high-quality, plagiarism-free work to you in the minimum amount of time. Waiting for your message.

$42 Chat With Writer
Top Quality Assignments

ONLINE

Top Quality Assignments

I reckon that I can perfectly carry this project for you! I am a research writer and have been writing academic papers, business reports, plans, literature review, reports and others for the past 1 decade.

$17 Chat With Writer
Finance Professor

ONLINE

Finance Professor

I have assisted scholars, business persons, startups, entrepreneurs, marketers, managers etc in their, pitches, presentations, market research, business plans etc.

$25 Chat With Writer

Let our expert academic writers to help you in achieving a+ grades in your homework, assignment, quiz or exam.

Similar Homework Questions

Collective noun for ostriches - Globalization - In this Professional Reflectionyou will build on what you have learned and experienced to create a set of guiding principles to use as a manager. guiding principles will enable you to employ the appropriate management style for each situation at hand. - Can someone do my Week 1 work for me Discussion 1 & 2 and in Organizational Behavior? - Balvenie caribbean cask lcbo - Chapter 12 review and assessment answers - Shrm bock model and its components - List of all conversion factors - Criminal justice decision making model steps - Financial management challenges and ethics - Bluej exercise solutions chapter 3 - War debris could cause cancer reading answers - OB - Jeff ely northwestern university - Bsg comprehensive exam answers chegg - Lulu temple plymouth meeting - Newspaper clipping that shows the use of statistics - Compare and contrast two different air traffic control entities - Doping in sports pros and cons - Usq recommended enrolment pattern engineering - Blue eyes brown eyes documentary - Thriving in college and beyond sparknotes - Colman mockler forbes magazine cover - Medical case 1 kenneth bronson - Culture box project ideas - Average fixed costs diminish continuously as output increases - Gattaca movie questions biology - Statistics - Accountable care organizations vs managed care - Compsis at a crossroads case study - Map application process of arapu - Pearsall v alexander - Summary of a novel in 100 words - Vitaly borker net worth - She is the hopeful lady of my earth - Why is it important to mark the solvent front immediately - Hunger games the game how to dodge knife - Is a dcp an environmental planning instrument - City and guilds 4692 - Nursing and Community (Due 24 hours) - Shell dobatex gold sds - Criss cross puzzle generator - Stepmother from snow white - Dau acq 202 module 2 test answers - Eso flipping the coin - Aromatic ammonia uses - Uva ltac - Physical threat to information systems - Amusement park map key - Nichols and Gehart& Tutttle - Lab 6 5 weather patterns answers - N491 Assignment Mod 6: case study - Tell the wolves i m home sparknotes - Edexcel gcse mathematics linear 1ma0 coordinates answers - Moreton bay regional council pd online - Sister cities of brisbane - Hum 105 world mythology - Catholic earthcare australia mission - Core high frequency word survey - Melbourne biodiversity conservation strategy - Junie b jones dad - 4 Pages Finance Paper - Themes of remember the titans - Writing assignment - Music teacher evaluation comments - Oh dear sound effect - 1 2 pound in kg - Smu google squared data & analytics programme - World War 2 - Hampshire county council ess lite - NCM_Journal Review - What is telstra hardware repayment option - The boy in the striped pajamas learning links answers - Which apps ship with splunk enterprise quiz - Two body relaxation time - Hp board of directors problems - Hot tapping gas pipeline - Capestone organic poultry ltd - Birches by robert frost meaning - Exotic feline breeding compound lawsuit - What is meant by the holistic approach in anthropology - Policy - Nursing - How to terminate rg6 - APA 7TH EDITION (4) - Cotton ball clouds meaning - Pacific trails resort case study - Economic integration can unintentionally reward a less efficient producer within a trading bloc. - Naive ticket machine project in bluej - Shepherd neame essex league - Mcelwain ward royal marsden - Opnet simulator free download for windows 7 64 bit - New shoes simulation marketing plan - Flat tire brewery in colorado - 200 word discussion - Knowlege check 5 - Mail yarra trams com au - Hale and pace proclaimers - A family friend has asked your help in analyzing - Body shop original owner