Overview
In this lesson students explore several important elements of simple electrical circuits. They learn what lamps do, how switches control the flow of electricity, and how conductive and nonconductive materials behave inside a circuit. Students work with real components including a battery box, lamp, alligator clips, and a switch to see firsthand how circuits open, close, and change paths. The tone of the lesson stays warm and encouraging, helping students feel confident as they move from understanding symbols to building working circuits.
Student Learning Goals
By the end of this lesson students will be able to: • Explain what a circuit is and why it must be a complete loop
• Describe how a lamp produces light
• Define conductivity and identify conductors and insulators
• Explain the purpose of a switch in a circuit
• Identify normally open and normally closed switches
• Build and test simple circuits using a lamp, switch, and battery box
• Record their circuit diagrams in their journals
Materials Needed
Battery box with batteries installed
Alligator clip wires
Lamp (small bulb)
Multimeter
Single pole double throw switch (SPDT)
Various materials for conductivity testing
Journals and pencils
Teacher Preparation Notes
Test the lamp and switch before class to be sure connections are reliable. Prepare a few simple circuits to show how an open loop stops electricity while a closed loop allows current to flow. Gather materials for conductivity testing: metal objects, plastic, rubber, wood, and other classroom-safe items. Review the diagrams in the slides so you can guide students through drawing them.
Safety Notes
We keep alligator clips away from skin and hair.
We hold lamps gently since the filaments inside can be delicate.
There is virtually zero electrical shock risk when using one AA battery box and classroom lamps.
We disconnect the battery box before changing wires or switches.
We do not test conductivity using liquids unless the teacher provides a controlled container.
Warm Up Activity
Ask students: If you flip a light switch at home, what do you think happens inside the wall? Let a few students share guesses. Explain that today they will explore the pieces that make lights and switches work.
Lesson Flow
Step One: Review the Idea of a Circuit
Show the slide explaining what a circuit is. Explain gently: A circuit is a loop. Electricity must go all the way around. If the loop breaks, the power turns off.
Have students draw a simple loop in their journals.
Step Two: Lamps and How They Work
Use the lamp slides to explain: • Lamps convert electricity mostly into heat (and a little into light).
• The filament inside gets hot and glows.
Show the symbol for a lamp and have students copy it into their journals. Share a brief warm note about Edison’s team and how success came from finding the right combination of materials.
Step Three: Conductivity
Use the slides to explain: Conductors let electricity flow easily. Insulators do not let electricity pass.
Show examples of each. Journal prompt: List three conductors and three insulators.
Optional: Let students test a few objects with the multimeter.
Step Four: Switches — Opening and Closing a Circuit
Introduce switches as the tool that allows us to control a circuit. Explain: • An open circuit stops electricity (power OFF).
• A closed circuit completes the loop (power ON).
Show the Normally Open and Normally Closed diagrams. Let students write NO or NC next to each one.
Step Five: Many Types of Switches
Show momentary switches, push buttons, and toggle switches. Introduce the idea of poles and throws: • Poles = how many circuits the switch can control.
• Throws = how many positions it can connect to.
Keep this explanation simple, reassuring students they do not need to memorize every detail right now.
Step Six: Build a Simple Circuit
Have students connect: • Battery box to lamp
• Lamp back to battery box using alligator clips
Ask: Is the circuit open or closed right now? Students should see the lamp light when the loop is complete.
Step Seven: Add a Switch to the Circuit
Introduce the SPDT switch from the slides. Guide students through attaching: • One red jumper to the center prong
• One red jumper to a side prong
Explain that the default position is OPEN. When they flip the switch toward the connected prong, they CLOSE the circuit and the lamp lights.
Have students create a circuit diagram in their journals showing this setup.
Step Eight: Practice Reading and Drawing Diagrams
Use the final slides for diagram practice. Students draw the circuit with the switch open. Then draw the exact same circuit with the switch closed.
Encourage neatness but reassure them that diagrams don’t need to be perfect.
Teacher Notes for Each Slide
Slide 1 Title: Introduce today’s focus and keep tone warm.
Slides 2–6 Lamp concept and Edison: Keep simple and inspiring.
Slides 7–11 Conductivity: Let students share examples.
Slides 12–15 Switches: Demonstrate open vs closed clearly.
Slides 16–20 Poles and throws: Use simple explanations.
Slides 21–26 Conductivity and lamp circuit test: Guide gently.
Slides 27–32 Adding a switch: Go slowly to avoid confusion.
Slides 33–end Diagram practice: Encourage teamwork and clarity.
Independent or Group Activity
Have partners design a small circuit that includes a lamp and a switch. They draw the diagram and then build the real version using the provided materials.
Vocabulary and Concepts
Conductor A material that electricity flows through easily
Insulator A material that blocks electricity
Switch A device that opens or closes a circuit
Pole How many circuits a switch can control
Throw How many positions a switch can connect to
Wrap Up
Ask: What surprised you most about lamps or switches? How did the circuit change when you added the switch?
Exit Ticket
Draw a lamp symbol and a switch symbol.
Or write one sentence explaining what an open circuit is.
Quiz
- What is a circuit?
- What does a lamp do with electricity?
- What is conductivity?
- What does a switch do in a circuit?
- What does it mean when a circuit is closed?
Teacher Reflection
Which concepts needed the most support today?
Did students connect diagram symbols to real components?
Was the hands-on activity paced correctly?