Students investigate the role of electricity in their environment, particularly how it is created and conducted through circuits. They learn to create series and parallel circuits while identifying and explaining the relationship between the necessary components. Students will design a procedure for testing the conductivity of various classroom objects as they discover the properties of conductors and insulators. A final unit project requires students to apply their knowledge of current electricity, circuits, conductors, and insulators while working to design and engineer an electronic game board. Students also evaluate electricity as a natural resource and discuss electricity from a global perspective.
View how a variety of student-centered assessments are used in the Light It Up Unit Plan. These assessments help students and teachers set goals; monitor student progress; provide feedback; assess thinking, processes, performances, and products; and reflect on learning throughout the learning cycle.
Part 1: Introducing the Unit
Generate student excitement for the upcoming Electricity Unit with a fun activity that is sure to pique their interest. This can be completed as a whole group or in small groups of 3-4 students. Pass out the Shocking Truths about Electricity activity sheet and ask students to discuss each item. As a group, have them select the 5 items that they believe are true and the 5 items that they believe are false. Follow up with a class discussion and encourage each group to explain their thinking. Note any misconceptions that will need to be addressed later in the unit as you announce the answers using the Teacher Key. Post the misconceptions somewhere in the classroom and return to them periodically throughout the unit to revise students’ thinking.
Building Background Knowledge
Ask students to think through a typical day and brainstorm a list of all the ways they encounter electricity. Next, ask them to consider daily life for Pioneers and Native Americans prior to the discovery of electricity. Facilitate a class discussion around the question, How is your life different because of electricity? Help students realize the valuable role of electricity in our daily lives and consider how our lives would change significantly without it. Share experiences with an electricity black-out or loss of power from a storm.
Gauging Student Needs
Begin by asking students, Where does electricity come from? How is electricity created? Use class discussion to begin assessing student background knowledge about electricity and circuits. In addition, the Electricity Pre-Assessment asks students to build a circuit that will light up a lightbulb and then explain how it works. Note that students are given extraneous components in the toolbox and not all pieces should be used to build the circuit. Throughout the unit, gauge learning needs by completing the Unit Assessment Checklist for each student and use the results to help guide and determine your unit content.
Part 2: Building Electricity Concepts
Exploring Static Electricity
Begin the lesson by dividing the class into small groups and giving each group a deflated balloon. Present a challenge: Without using any additional materials from the classroom, how could you get your balloon to stick to the wall exactly four feet off the ground? Take anecdotal notes on students’ understanding as they work on this challenge.
After providing ample time for inquiry and experimentation, perform a class demonstration by rubbing an inflated balloon against a student’s hair and then holding it near a wall. Challenge students to not just describe what is happening, but also hypothesize about their observations. Ask students, “What is causing the balloon to stick to the wall? Which type of electricity is being created? What do you think would happen if I rubbed this balloon against a desk first? How about a sweater?”
Explain how the balloon picks up extra electrons when it is rubbed against a student’s hair, making the overall charge of the balloon negative. When the negative balloon is placed on the neutrally-charged wall, the electrons in the balloon attract the protons and make the surface of the wall positive. A key understanding here is that opposites attract. The force of attraction created between the negative charges in the balloon and the positive charges on the wall causes the balloon to stick. The charge on the protons and electrons provides the basis of understanding static electricity. Depending on your students’ background knowledge, you may need to review the concept of protons, neutrons, and electrons during this lesson. For additional support resources, visit these websites:
Discuss with the students, Do you think there are different types of electricity? Explain that this demonstration showed them the concept of static electricity. Another type of electricity, current electricity, will be introduced later in the unit. Follow up the balloon demonstration with a PhET science simulation, Balloons and Static Electricity*. Using an interactive whiteboard or computer projector, show students how to complete the simulation. Ask students to explain how the interaction between positive and negative charges effects how the balloon behaves in relation to the wall, the sweater, and another balloon. If possible, allow each student ample time to explore the simulation on their laptop computer or in a computer lab.
By now, students should understand that static electricity is created when electrical charges build up on the surface of a material. They should also be able to explain that opposite charges attract while like charges repel. As students have seen in the PhET simulation, static electricity is usually caused by rubbing materials together. The result of a build-up of static electricity is that objects may be attracted to each other or may even cause a spark to jump from one object to the other. Ask students to brainstorm other ways that they have encountered static electricity.
Another PhET science simulation effectively demonstrates how static electricity buildup can create an electric spark. In John Travoltage*, students see how charges created from a foot rubbing against a carpet can build up inside the body until an object (for example, a doorknob) transfers these excess charges. Ask students to compare the two simulations: What science ideas are similar in both demonstrations? How are they different? How can static electricity be useful in real life? (photocopiers, spray painting car parts, pollution control).
Getting Connected with Simple Circuits
Building upon your students’ knowledge and experience with static electricity, explain that another type of electricity is called current electricity. Unlike static electricity, which is produced by the charges created from rubbing materials together, current electricity is produced by moving electrons through a conductor.
Explore the flow of electric current by first showing students the components of a simple circuit. Prior to this lesson, collect the materials needed to build a simple circuit that will light a lightbulb. To do this, you will need:
Detailed instructions for building a simple circuit can be found at http://www.ehow.com/how_5090988_make-simple-circuit.html*.
Ask your students to identify the different parts of a simple circuit. Explain that a simple circuit is a closed path through which electricity flows. The flow of electrons through a conductor is what creates current electricity. To demonstrate this idea, ask your students to place a light bulb directly on top of a battery and hypothesize why the bulb does not light up. Explain that the flow of electrons is what creates the electricity needed to light the bulb.
Now, ask students to direct you and help you light the bulb using a battery and wire in a simple circuit. The Circuit Handout details and illustrates each component of an electric circuit. Note: At this point, it is dangerous to let students simply experiment with creating an electric circuit before they have the proper knowledge needed to stay safe. To maintain the inquiry and thoughtfulness of the lesson, while also maintaining safety, it is best to let the students lead you in designing one circuit in front of the class.
When students have a basic understanding of simple circuits, it’s time to challenge them to design their own! On laptop computers or in a computer lab, help students navigate to Circuit Construction Kit*, a PhET simulation where they can experiment with the various components of a simple circuit. One unique advantage is that the simulation gives students the ability to experiment with an unlimited number of supplies in a safe environment that will not spark or overheat if the circuit is overloaded. Therefore, when playing with the simulation, encourage students to experiment with more complex and creative circuits while using scientific terminology to describe their designs. Hand out the Circuit Construction Kit Handout (Part 1) to help guide and assess their understanding.
Optional: Advanced students may benefit from exploring the Circuit Construction Kit (AC+DC)*. The addition of capacitors, inductors, and AC voltage sources will challenge their understanding and construction of electric circuits.
Turn On the Light: Series and Parallel Circuits
Challenge your students’ thinking by asking them to observe and count the number of items in the classroom that are currently consuming electricity and ask, “Do you think each item in this classroom receives electricity through a simple circuit? Why or why not? What would be some problems with this model? How can we control the amount of electricity and where it travels?” Use this class discussion to introduce the concept of series and parallel circuits.
On laptop computers or in a computer lab, help students navigate back to Circuit Construction Kit*. As before, students will use the various components to test and build their own circuits. Ask each student to arrange their materials in a way that will light 3 light bulbs in a row, or series. Encourage students to explain their thinking using correct terminology and their knowledge of simple circuits. Use scaffolding and guiding questions to help students discover how to create a series circuit. Then, ask students to sketch their circuit on the Circuit Construction Kit Handout (Part 2) and list the key characteristics of a series circuit.
Next, challenge students to arrange their materials in a way that will light 3 bulbs using 3 different wires that run parallel to one another. Again, students will sketch their circuit on the Circuit Construction Kit Handout (Part 2) and list the key characteristics of a parallel circuit.
After ample time for exploration and experimentation, ask students to apply their knowledge of series and parallel circuits to discover important differences between the two. Encourage class discussion through questioning:
Exploring Conductors vs. Insulators
An important piece of understanding current electricity is exploring conductors and insulators. First, review previous learning by asking students, “What are the components of a circuit? What role does each component play?” After reminding students of the role of wire in a circuit, ask them to apply their knowledge to the following questions:
Pose the problem, How can we identify objects that will allow electricity to flow and objects that will not allow the flow of electricity? Next, introduce the terms “conductor” and “insulator” with a whole-group demonstration. For this role play, choose five students to be part of a copper wire. Tell them that they represent the atoms in the wire and place them about 3 feet away from each other in a row. Either the teacher or another student can play the role of an electron that is part of an electrical flow, easily weaving between the atoms of the wire and thus conducting electricity. Explain that the copper wire is a conductor because it allows the flow of electricity. Then ask five other students to be the atoms in a piece of paper. Place these students shoulder to shoulder in a row. When the electron (another student) tries to get through, it gets blocked by the atoms and therefore the flow of electricity is stopped. Explain that a piece of paper is an insulator because it prevents the flow of electricity.
After the whole group demonstration, direct students to their laptops or a computer lab for Will It or Won’t It?*, a simulation that allows students to test the conductivity of various household items in a virtual environment. This simulation is part of Intel®’s The Journey Inside*, a collection of interactive online lessons for students to learn about technology, computers, and society.
Another resource for exploring conductors and insulators is the PhET Conductivity* simulation. Students can interact with the controls to experiment with conductivity in metals, plastics, and photoconductors. The flow of electrons is illustrated to help students visualize why metals conduct electricity and plastics do not. The Conductivity Handout will help guide and assess students’ understanding.
Part 3: An Electricity Project
Building an Electronic Quiz or Game Board
In the final unit project students apply their knowledge of current electricity, circuits, conductors, and insulators while working to design and engineer an electronic quiz or game board. Their game is shared with other classrooms as part of a Game Day design challenge.
Explain to the students that they will design a board that provides the user with instant feedback about their answer using a light bulb, buzzer, or similar device. The user interacts with the game board by selecting a question and an answer, receiving immediate feedback on whether their answer is correct or incorrect. Behind the scenes, under the quiz board, is a network of circuits that use conductors and insulators to connect each question with the corresponding answer. View the student sample quiz board for an example. Students may choose any content area for their board, or you may wish to work with another teacher to create an interdisciplinary project. For example, you might require your students to create a game board that ties into a current unit of study in their social studies classes. On Game Day, invite students from other classes to come and try out the electronic game boards. Challenge your students to design a complex and creative game that will interest and engage their visiting peers. Another option is to hold a Game Night and invite parents to the school to celebrate the students’ learning.
A Project Checklist will provide clear expectations and guidelines for students as they begin to design their board. In addition to designing a functional quiz or game board, students will be required to write up an explanation of how it works using correct terminology learned throughout the unit.
Students are assessed according to the functionality of their game board, creativity, complexity, and knowledge of conducting electricity through series and parallel circuits. Use the Project Rubric to assess learning and determine how well each student met the unit goals and objectives.
Part 4: Unit Wrap-Up
Wrap up the unit by handing back the unit pre-assessments. Ask each student to revise their thinking and make corrections to the circuit they attempted to design prior to the unit. Use the same Unit Assessment Checklist to measure student learning gains. Address any remaining misconceptions or questions that remain. Encourage students to reflect upon their learning by answering the following discussion questions in a writing journal:
If time and student interest permit, you can follow up or extend the unit with Using Electricity on the Job: Why care about Earth?*, another unit plan from the Designing Effective Projects collection. In this unit students answer the questions, Why is electricity important? and What jobs use the concepts of electricity in significant ways? as they develop positive publicity materials that promote and educate others about careers involving electricity.
English Language Learner
This unit is aligned to Common Core National and Next Generation Science Standards.