Lab 0 - Circuit Building worksheet1234

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Arizona State University *

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114

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Electrical Engineering

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Feb 20, 2024

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1 C I R C U I T B U I L D I N G – W O R K S H E E T Name: Leslie Moroyoqui Amado Partners: Theo, Margie TA: Rajesh Shrestha Part 1 – Anatomy of a Lightbulb Diagram (12 pts) Part 1 (12+18): Part 2 (16+12): Discussion Qs (27): Clean-up (3): Total (88): Glass shell filament Insert gas Metal stem Screw threads Center contact Insulating rings Insulating bead Metal Blob

2 Explain the purpose of each of the components (2 pts each): Filament: Filament is the electricity that is made to flow through an extremely thin piece of wire. Metal stems: Metal stems purpose is to support filaments in its place. Metal blob (a.k.a. solder): Metal blob purpose is internal- external electrical continuity. Screw threads: The screw thread purpose is to ensure the lightbulb fits into its socket and adheres to the specification of the input. Center contact: Provides electrical connections to the filament. Insulating ring: It forces charge to go from the central contact up to the filament and then back to the screw. Insulating bead: Ensures the metal stems do not touch each other. Glass shell: The glass shell ensures light efficiency and provides support for parts of the bulb. Inert gas: slows down the evaporation of the filament.

3 Part 2 – Series & Parallel Circuits Circuit 1 diagram (4 pts, remember to label the bulbs!): Brightness with all bulbs screwed in (scale of 0-10): Bulb 1: ___6_______ Bulb 2: _6_________ Bulb 3: ____6______ Brightness after unscrewing bulb 1 (scale of 0-10): Bulb 1: ___0_______ Bulb 2: ___7_______ Bulb 3: ______7____ Brightness after unscrewing bulb 2 with bulb 1 screwed in (scale of 0-10): Bulb 1: ____7______ Bulb 2: ___0_______ Bulb 3: _______7___ Circuit 2 diagram (4 pts, remember to label the bulbs!): Brightness with all bulbs screwed in (scale of 0-10): Bulb 1: ___9_______ Bulb 2: __9________ Bulb 3: ____0______ Brightness after unscrewing bulb 1 (scale of 0-10): Bulb 1: ____0______ Bulb 2: ___0_______ Bulb 3: _____0_____ Brightness after unscrewing bulb 2 with bulb 1 screwed in (scale of 0-10): Bulb 1: ___0_______ Bulb 2: ___0_______ Bulb 3: _____0_____

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4 Circuit 3 diagram (4 pts, remember to label the bulbs!): Brightness with all bulbs screwed in (scale of 0-10): Bulb 1: ___10_______ Bulb 2: __2________ Bulb 3: ____2______ Brightness after unscrewing bulb 1 (scale of 0-10): Bulb 1: _____0_____ Bulb 2: _____0_____ Bulb 3: ___0_______ Brightness after unscrewing bulb 2 with bulb 1 screwed in (scale of 0-10): Bulb 1: __8________ Bulb 2: _____0_____ Bulb 3: ___8_______ Circuit 4 diagram (4 pts, remember to label the bulbs!): Brightness with all bulbs screwed in (scale of 0-10): Bulb 1: ___9_______ Bulb 2: ___6_______ Bulb 3: ____6______ Brightness after unscrewing bulb 1 (scale of 0-10): Bulb 1: ____0______ Bulb 2: _____6_____ Bulb 3: _____6_____ Brightness after unscrewing bulb 2 with bulb 1 screwed in (scale of 0-10): Bulb 1: ______10___ Bulb 2: ___0_______ Bulb 3: ______0____

5 DISCUSSION QUESTIONS 1. (3 pts) What is your TA’s name? Rajesh Shrestha 2. (5 pts) Based on your investigation in part 1, would you classify the filament as being in series or parallel with the metal stems? What would you say for the stem-to-outer-threads connection, or for the stem- to-center-contact connection? In the filaments it is classified in series. The stem-to-outer threads and the stem-to-center-contact are in parallel. It is all in series. 3. (5 pts) From part 2, is circuit 1 a series or parallel circuit? How about circuits 2, 3, and 4? (Hint: some circuits may not be strictly series or strictly parallel.) From part 2, circuit 1 is a parallel with 2 and 3. Circuit 2 and 3 are series and circuit 4 is parallel.

6 4. (4 pts) Is a “junction post” a necessary component for creating a junction? If yes, why is it necessary? If no, what is another way you could create a junction without using a junction post? A junction is not necessary, but it does benefit distribution. A clasp by itself should be enough to create light. 5. (5 pts) Consider Figure 1 and Figure 2 in the lab manual. Which of the labeled points (a-g) is a junction? Why? Only d, and f are junction is figure 1 and 2 because it is where two or more paths meet. 6. (5 pts) From part 2, you should have noticed sometimes unscrewing a lightbulb caused other lightbulb(s) to turn off completely, but in other cases, unscrewing a lightbulb had no effect on the other lightbulbs. Why is this the case? Unscrewing a lightbulb caused others to turn off completely because it depends if they are parallel or series.

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