Following the guidelines of the project, students will construct a light-weight two-story electric house in which they will construct separate series, parallel, and complex circuits.
Requirements for The Electric House
The house must have at least one series circuit consisting of a switch and at least two Christmas tree lights powered by a nine volt battery.
The house must have at least one parallel circuit consisting of a switch and at least two Christmas tree lights powered by a second nine volt battery.
The house must have at least one complex circuit consisting of a switch, at least two Christmas tree lights, and one "doorbell" (or buzzer) powered by a third nine volt battery.
Description of The Electric House
The house will consist of two stories. Each story will contain at least two rooms. Each individual room will be illuminated by its own light. There should be a front door, a porch, and a porch light. Your house circuits should be able to light the first floor lights and the porch light separately from the second floor lights and the doorbell.
Materials for The Electric House
At least six Christmas tree light bulbs
Three nine volt batteries.
Three switches. (or some combination)
Two average size rolls of insulated wire (it is helpful to have one red and one black roll). Suggestion: if you are using a strand of Christmas tree lights (the samll ones), there is enough extra wire! It works perfectly.
Doorbell or buzzer. Suggestion: use a Piezo buzzer available at electronics stores. They cost approximately $3.00.
Foam-core paper sided project board. Suggestion: Recycle your science fair tripanel.
Each student will answer the following questions. You may submit your answers using the following form.
Form to submit responses to questions
Each question is worth eight points. Four points will be awarded for a correct response. Four points will be awarded for the appropriate supporting statements. In each of the questions, assume that the light bulbs have the same resistance. In each of your responses, describe what percentage of the current each light bulb originally carries. In each of your responses, describe how the described action will affect the intensities of the remaining lit light bulbs.
All answers must be in complete sentences.
You have three light bulbs. All have the same intensity when lit. Explain how you can determine that they are connected in series by unscrewing one light bulb. Support your answer.
You have three light bulbs. All have the same intensity when lit. Explain how you can determine that they are connected in parallel by unscrewing one light bulb. In your response, state the relationship between the current and resistors in parallel.
You have three light bulbs. Two are connected in parallel. This parallel combination is connected in series with the third light bulb. Describe the relative intensity of each bulb. Support your answer.
In question number three, describe the relative intensities of the two remaining lit bulbs if one of the bulbs in parallel was unscrewed. Support your answer.
You have four light bulbs, light bulbs one, two, three, and four. All have the same intensity. Bulb one is unscrewed causing only bulb one to go out. Now, bulb two's intensity is 30% greater than it was originally. Bulbs three and four each have 2/3 of their original intensity. Based upon this information, how are the four bulbs wired? Support your answer.
The Electric House Project
Objective: Your team (maximum of 3 students) will design and construct an electric house with separate series, parallel, and complex circuits (contains both series and parallel circuits). The house will consist of one or two stories. Each house will contain at least the following areas: one bedroom, one bathroom, a kitchen, a porch, a frontdoor, and a living room/dining room area.
Each individual room will be illuminated by its own light.
Materials: Your team will need the following materials toconstruct and wire the home the house frame,
- The living room area must have a chandelier with at least two lights in a
SERIES CIRCUIT with a switch.
- The house must have one PARALLEL CIRCUIT consisting of a switch and atleast two lights. - The house must have one COMBINATION CIRCUIT consisting of two
switches and at least three lights.
- The front door must have a doorbell (buzzer) and a switch. Scoring Rubric: The score of your project consists of 140 points divided into two parts: I. Group Project = 100 points Meeting minimum construction requirements:
Neat house assembly, four rooms, and a porch = 20 pts
Successfully meeting series circuit minimum requirements = 10 pts