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

Resistance in circuits lab report

06/12/2021 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

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:

Engineering Guru
Unique Academic Solutions
Top Class Engineers
Assignment Helper
Helping Hand
Isabella K.
Writer Writer Name Offer Chat
Engineering Guru

ONLINE

Engineering Guru

I have worked on wide variety of research papers including; Analytical research paper, Argumentative research paper, Interpretative research, experimental research etc.

$19 Chat With Writer
Unique Academic Solutions

ONLINE

Unique Academic Solutions

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.

$38 Chat With Writer
Top Class Engineers

ONLINE

Top Class Engineers

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.

$48 Chat With Writer
Assignment Helper

ONLINE

Assignment Helper

I am a professional and experienced writer and I have written research reports, proposals, essays, thesis and dissertations on a variety of topics.

$49 Chat With Writer
Helping Hand

ONLINE

Helping Hand

I have read your project details and I can provide you QUALITY WORK within your given timeline and budget.

$32 Chat With Writer
Isabella K.

ONLINE

Isabella K.

I have done dissertations, thesis, reports related to these topics, and I cover all the CHAPTERS accordingly and provide proper updates on the project.

$50 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

Bob dylan the times they are a changin meaning - Hula hoop personal space activity - The answer women's clothing store - Still alive ruth kluger chapter summaries - How much is a 45kg gas bottle from elgas - Force board lab report - What is a prodrug - Biology 1 - Dettol product company name - Article Analysis and Evaluation of Research Ethics - Purnell model for cultural competence - Introduction to the human body quiz - Igcse physics magnetism questions - Simon ielts writing task 2 general training - Under and over 7 dice game - Why is bach's brandenburg concerto no 5 unusual - Import quotas on japanese cars case study answers - What are ikea's competitive priorities - Assignment - Improving the Lives of Impoverished Women - Cloud Computing - Essentials of negotiation lewicki 5th edition pdf - Physical chemical changes lab answers - Barriers to np practice that impact healthcare redesign - Paralyzed veterans of america address labels - Quantitative spectroscope and visible light lab - Supreme court act bahamas - Policy - List of ethnic slurs - An atlas of impossible longing summary - Narrative essay - Trinity industries organizational chart - Ward 1c whiston hospital - Nursing care plan for vomiting - Business Intellg (Dis) - The good earth characters - MG315 Discussion Post 4 - If a substance is completely consumed in a chemical reaction - Answers to webassign physics homework - Api 653 inspection report - How far will you travel worksheet - Simulation - 01.07 collapse of an empire - Chinese weight loss patch instructions - Naeyc code of ethical conduct powerpoint - Success factors vail - Free your mind and the rest will follow quote - When might neutralization reactions be used in a laboratory setting? - Temporary works register template - Change for life campaign evaluation - Pause proceed with caution strategy - System cooling policy passive - Desert survival activity answers - The gangster we are all looking for chapter 4 summary - Dr treves elephant man - Coral Language is a simple language to help teach programming concepts. - Recruiting and Training Volunteers - Veracity definition nursing - Mechanical advantage formula ramp - Hyllus maris spiritual song of the aborigine - Analysis of cherry pink and apple blossom white - Metal box club speke - Sylvestrian centre holiday club - Andrew jackson quotes on indian removal - Pyramid vertices edges faces - Calculus ab practice test - Junqueira's basic histology test bank pdf - Post-Tania - How medical technology shapes society - Upu edi messaging standards - Which artifact depicts the unification of upper and lower egypt - Nursing Statistics - Discussion lamp circuit wiring - Academic misconduct letter sample - Beloved wife is not well behaved baka - Finding nemo net scene - Booker T Washington Vs W.E.B DuBois - Nadie quiere comer en ese restaurante. - What is cost of labor on form 1125 a - Describe each of the activities that comprise strategy evaluation - Minor 3 - Bbc ancient greece - Percent yield problems worksheet - Different types of magic squares - Hcl cmmi level 5 certified - Igcse art and design scheme of work - An introduction to law and legal reasoning pdf - G41 g42 interference alarm - In a red dress and alone meaning - World War 2 - Cloud computing - Henry ford college webadvisor - Engineering mechanics statics in si units - Rosemount 644 ordering information - Don t complicate it in textspeak - Reflective Paper and Practical Connection Paper - 540 fe - The rotation of rod oa about o is defined - Discussion 2 - Author of a walk to remember