Electric Charge Basics

Unit: Exploring Atomic Structures

Lesson 4 of 10

Duration: 45 minutes
Grade: 10th
Class Size: 30 students

Lesson Overview

Students will explore the fundamental concept of electric charge. Through hands-on demonstrations of static electricity and guided inquiry, they will discover the nature of positive and negative charges and the principles of charge interaction (attraction and repulsion). This lesson will build foundational understanding for future atomic and electromagnetic studies.

Learning Objectives

By the end of this lesson, students will be able to:

Define electric charge and identify the two types (positive and negative).
Describe how electric charges interact: like charges repel, unlike charges attract.
Explain static electricity phenomena through real-life demonstrations.
Analyze and interpret observations related to electric charges and static electricity.

NGSS Alignment

Performance Expectations:

HS-PS2-6: Communicate scientific and technical information about why the atomic-level structure is important in the interaction of electric charges.
HS-PS2-1: Analyze data to support the claim that Newton’s second law of motion describes the mathematical relationship among the net force on a macroscopic object, its mass, and its acceleration. (Supporting concept)

Science and Engineering Practices:

Planning and Carrying Out Investigations
Using Mathematics and Computational Thinking
Engaging in Argument from Evidence

Disciplinary Core Ideas:

PS2.A: Forces and Motion - Electrically charged objects exert forces on each other even when the objects are not in contact.
PS2.B: Types of Interactions - Attraction and repulsion between electric charges at the atomic scale explain the structure, properties, and transformations of matter.

Materials Needed

Balloons (2 per student)
Wool cloths or scarves
Plastic combs (optional)
Aluminum cans (empty)
Styrofoam or plastic rods
Pieces of tissue paper or small bits of paper
Whiteboard and markers
Projector for images/videos (optional)

Lesson Breakdown

Time	Activity	Details
0-5 min	Engage: Electric Charge Brainstorm	Teacher Activity: Start by asking students what they know about “electric charge”. What happens when you rub a balloon on your hair? Collect ideas and write them on the board. Use this to activate prior knowledge and pinpoint misconceptions.
5-15 min	Explore: Static Electricity Demonstrations	Student Activity: In pairs, students rub balloons on their hair or wool scarves. They will observe phenomena like hair standing up, balloons sticking to walls, or attracting small pieces of paper. Teacher facilitates by asking guiding questions: “What is happening at the particle level?” “Why do objects stick or repel?”
15-25 min	Explain: Concept Introduction and Discussion	Teacher-led: Present the concept of electric charge: positive (+) and negative (-). Use diagrams showing electrons and protons, emphasizing that electrons are mobile and responsible for static electricity. Explain attraction and repulsion using charge interaction rules. Visuals to reinforce learning.
25-35 min	Elaborate: Charge Interaction Activity	Group Activity: Each group uses a charged balloon and an aluminum can to explore forces acting at a distance. Encourage students to predict, observe, and explain outcomes. Record observations in science notebooks using drawings and written notes. Teacher circulates to prompt deeper reasoning and connect ideas to atomic structure.
35-40 min	Evaluate: Quick Concept Quiz & Discussion	Individual Assessment: Short formative quiz consisting of multiple choice and short answer questions to assess understanding of electric charge types and interactions. Examples: “What type of charge does rubbing a balloon on wool create?” and “What happens when you bring two negatively charged balloons close together?”
40-45 min	Elaborate and Reflect: Real-World Connections	Wrap-up Discussion: Relate static electricity to real-world phenomena (lightning, photocopiers). Open floor for students to ask questions or share personal experiences with static electricity. Assign a reflective exit ticket: “Describe in your own words why electric charges matter in the natural world.”

Differentiation Strategies

For students who need support: Provide visual aids and simplified explanations. Offer sentence starters for the quiz and exit ticket.
For advanced learners: Challenge them to explain why charge is conserved and how electric fields operate at atomic levels. Encourage them to research and present examples of technology based on electric charges.

Assessment

Formative throughout: observation during demonstrations, student reasoning during group activity, and participation in discussion.
Quick quiz to check comprehension of charge types and interactions.
Exit ticket to assess ability to connect concepts to real-world scenarios.

Teacher Notes

Safety reminder: Ensure students handle materials gently to avoid breakage or injury during demonstrations.
Consider capturing the demos on video for students to review later or for absent students.
Encourage curiosity by emphasizing the mystery and power of electric forces beyond visible interactions.

Extension Idea (Optional)

Introduce Van de Graaff generator demonstration or video (if available) to visualize charge accumulation and spark phenomena, linking atomic theory to tangible electric charge effects.

Harnessing hands-on experiences and adherence to NGSS, this lesson balances inquiry, conceptual clarity, and relevance — designed to engage 10th graders and deepen their atomic structure exploration through electric charges.

Teaching Instructions