Circuit Construction Kit DC-2 (1) (1)

docx

School

Ivy Tech Community College, Columbus *

*We aren’t endorsed by this school

Course

102

Subject

Electrical Engineering

Date

Apr 3, 2024

Type

docx

Pages

Uploaded by MateDugong7537

Circuit Construction Kit DC 4/2/10 Loeblein https://phet.colorado.edu/en/contributions/update-success/5436 (adapted from Argenta Price, Alan Calac Discovering patterns of current and voltage in series and parallel circuits ) page1 This lab uses the Circuit Construction Kit DC simulation from PhET Interactive Simulations at University of Colorado Boulder, under the CC-BY 4.0 license. https://phet.colorado.edu/sims/html/circuit-construction-kit-dc/latest/circuit-construction-kit- dc_en.html Learning Goals ● Explore basic electricity relationships. ● Explain basic electricity relationships in series and parallel circuits. ● Use an ammeter and voltmeter to take readings in circuits. ● Provide reasoning to explain the measurements and relationships in circuits. Prediction Questions Consider the pictures of each of these circuits, then answer the questions below. Series Circuit Parallel Circuit Complex Circuit Figure 1: first circuit is a series circuit , second is parallel, and third is complex(mixed) 1. From the circuits above, predict which bulb (or bulbs) will be the brightest. Why do you think that? Bulb 3, 4 and 7 because they are in parallel 2. Current is the flow of charge (measured in coulombs/sec = amps) in a circuit. Describe how you think current will flow in the different types of circuits above. a) current will be the same because they are connected in series b) current will also be the same if they are identical because they are connected in series. c) Current through 5 and 6 added together will be equivalent to bulb 7. Bulb 7 will have a greater current Develop your understanding: 3. Explore the Intro screen of Circuit Construction Kit DC a. Build a circuit that shows how to make a light bulb light up. b. Figure out how to measure current and voltage. c. Insert an image of your circuit with the current and voltage measured.

Circuit Construction Kit DC 4/2/10 Loeblein https://phet.colorado.edu/en/contributions/update-success/5436 (adapted from Argenta Price, Alan Calac Discovering patterns of current and voltage in series and parallel circuits ) page2 4. Imagine you’re an engineer making a string of battery powered holiday lights. If a bulb burns out current cannot flow through that bulb any longer like if the wire at the bulb has been cut. Figure out how to hook up 2 light bulbs and a battery so that when one bulb burns out or is disconnected the other stays lit. a. Insert images to illustrate that your circuit works as expected. b. Explain why you think it works. It works because this is a parallel circuit, if a light bulb goes out the second still gets current through it. 5. Imagine that you want to make sure the battery for your string of lights will last as long as possible. A battery will last longer if it powers a circuit with low current. How could you hook up a battery and 2 light bulbs so the least amount of current flows through the battery? Use the measurement tools in the simulation to check your design. a. Insert images to illustrate that your circuit works as expected.

Circuit Construction Kit DC 4/2/10 Loeblein https://phet.colorado.edu/en/contributions/update-success/5436 (adapted from Argenta Price, Alan Calac Discovering patterns of current and voltage in series and parallel circuits ) page3 b. Explain why you think it works. Ohm’s law is Current = Voltage/ Resistance. So, if you increase resistance, you will decrease current. One way of increasing resistance is by opening the switch, as seen above, to limit the flow down the same pathway which increases resistance and reduces total current. In a series circuit, you can add resistors to decrease current. Develop your understanding Part 2 Instructions: Your goal in this part is to write rules to describe how patterns of current and voltage in a circuit relate to the structure of the circuit. You will need to measure current and voltage in multiple places on several different circuits. Examples: Measuring Current Measuring Voltage “Current” is the flow of charge, measured in Amps (Coulombs/s). An ammeter measures the current past a single point in the circuit. The current flowing through point 1 can be written as: I 1 = 0.09 A. “Voltage” is a measure of the difference in electric potential between two points. The voltmeter measures this difference by placing the two leads (pronounced “leeds”) at two different points. The voltage between points A and B can be written as V AB = 9 V. A Use the table below to record your measurements and patterns you notice. You decide where will be the most useful places to take measurements, and how many to take.

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Circuit Construction Kit DC 4/2/10 Loeblein https://phet.colorado.edu/en/contributions/update-success/5436 (adapted from Argenta Price, Alan Calac Discovering patterns of current and voltage in series and parallel circuits ) page4 Circuit Label the places where you decide to measure current and voltage. Try several places. Current Measurement s (Amps) Voltage Measurement s (Volts) . What patterns do you notice? Where is the current the same? Where is it different? Where does the voltage change? Where doesn’t it change? How do the different circuits compare? 1) Simple Circuit Label on the picture the places where you measure (See examples Example: I1 = 0.9A I2 = 0.9A I3 = 0.9A I4 = 0.9A I5 = 0.9A I6 = 0.9A Example: V1,2 = 0v V2,3 = 0v V3,4 = 9v V 4,5 = 0v V6,1 = -9v - The current is the same throughout the circuit - The voltage is the same throughout the circuit - Single closed loop with two terminal single path for current flow. - above ). 2) Series Circuit - The current is the same throughout the circuit - Commented [1]: Draw this on paper and insert an image of your drawing. Commented [2]: Draw this on paper and insert an image of your drawing. Commented [3]: Draw this on paper and insert an image of your drawing.

Circuit Construction Kit DC 4/2/10 Loeblein https://phet.colorado.edu/en/contributions/update-success/5436 (adapted from Argenta Price, Alan Calac Discovering patterns of current and voltage in series and parallel circuits ) page6 Summarize your understanding: 6. Compare the patterns you see in a series circuit to the ones you see in parallel and complex circuits. Write rules about voltage and current for each type of circuit. For example, “In a series circuit, I see that the current ….., whereas in a parallel circuit I see… ”. In a series circuit, I see that the current is the same everywhere and the voltage drops between resistors (bulbs) but its sum is equivalent to the battery voltage. With the parallel circuit, voltage remains the same everywhere and the current drops between resistors. Where there are two bulbs/resistors, the current flow is less, meaning the brightness of the bulbs is weaker between resistors in series 4) Complex circuit

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Circuit Construction Kit DC 4/2/10 Loeblein https://phet.colorado.edu/en/contributions/update-success/5436 (adapted from Argenta Price, Alan Calac Discovering patterns of current and voltage in series and parallel circuits ) page7 Test your understanding 7. Predict from your rules above, the order of the light bulbs in these circuits from brightest to dimmest. Some bulbs might be the same brightness. a) (order the bulbs by brightness) 1 = 6 > 7 > 2 = 3 = 4 = 5 > 8 =9 b) After you make your rankings, build circuits to check your answers and list the correct ranking below. Insert images from the simulation to support your sequence. Here you can see how the bulbs in series ( 2,3,4,5) are dimmer than bulbs in a single circuit ( bulbs 1, 6) c) Did your rules allow you to correctly rank the bulb brightness? If not, correct your rules in #6. yes d) Did you use any meters to help you make your list? If so, explain why. More uninterrupted current flow through the bulb will produce more power/brightness. The bulbs with more current are the brightest. Brightness is related to power. P = V * I 8. If you want to make a flashlight and have two batteries and a lightbulb. a) Predict how you would hook them up to make the brightest flashlight, and explain why. I would hook up the battery and the bulb in parallel to achieve the brightest possible bulb. b) Build circuits to check your answer and insert images from the simulation for evidence.