Introduction to Electricity
A tiny shock from a doorknob and a giant bolt of lightning are the same thing at very different sizes. Both come from charges that build up and then move.
What You'll Be Able to Do
By the end of this lesson, you will be able to:
- State what students will be able to do.
- Set a clear target before content begins.
- Goal setting
- Advance organizers
- Understand to Analyze
- DOK 1 to 3
- Plain "I can" statements
- Standard code shown for reference
- Short, scannable cards
Words You'll Meet
Choose a card to see what each word means.
- Front-load the terms students will meet.
- Lower the language barrier before reading.
- Pre-teaching vocabulary
- Reduced extraneous load
- Remember to Understand
- DOK 1
- One card open at a time
- Click to reveal, no hover
- Plain, short definitions
Zap! Where Did That Come From?
You shuffle across a carpet in socks, reach for a metal doorknob, and snap, a tiny spark jumps to your hand before you even touch it. The same kind of event, scaled up, lights the whole sky during a thunderstorm.
A Spark Across the Gap
Nothing about your finger or the doorknob looks electric. Yet a spark crosses the air between them, and you feel a pinch. No batteries, no wires, no outlet. Lightning does the exact same thing between a cloud and the ground, only millions of times larger. So where does this hidden energy come from, and how can it leap across a gap with nothing touching?
The best answer is B. Rubbing your feet on the carpet moves tiny particles called electrons onto your body. That extra charge builds up until it has somewhere to go. When your hand gets close to the metal doorknob, the charge jumps the gap as a spark. To understand the shock and the lightning, we have to look at what charges are and how they move. That is exactly where this lesson goes next.
- Anchor the lesson in a familiar phenomenon: a static shock.
- Raise a question students will want answered.
- Curiosity gap
- Phenomenon-based learning
- Understand
- DOK 2
- Concrete, familiar examples
- Short framing text
- Visual anchor
One Idea to Keep in Mind
Here is the one idea electricity depends on. All matter is made of atoms, and atoms are made of protons, neutrons, and electrons. Electricity is all about those charged particles, especially electrons, moving from place to place. That is everything you need to start.
Want to go deeper on atoms and their parts before diving in? This optional extension explores the protons, neutrons, and electrons inside every atom. You do not need it to understand this lesson, but it is a great way to see where charge comes from.
Explore →- State the one supporting idea, atomic structure, that electricity builds on.
- Keep the lesson self-contained while offering an optional path to go deeper.
- Prior knowledge activation
- Spaced retrieval
- Remember to Understand
- DOK 1
- Optional and clearly labeled
- Single, focused review link
- Plain explanation of why it helps
Two Kinds of Electricity
Electricity is a form of energy made up of electric charges. Those charges can do two different things: they can build up and stay in place, or they can flow. That difference gives us two kinds of electricity.
Electricity can produce light in a bulb, heat in a toaster, and motion in a fan. All of these come from electric charges. The question is whether the charges are sitting still or moving.
- Charge that collects or builds up on the surface of an object
- The charge stays in place until it has somewhere to go
- Examples: a shock from a doorknob, lightning
- The flow of electric charges through a material
- Charges move through a conductor such as wire
- Examples: power lines, computers, appliances
- Sort electricity into two clear categories first.
- Name where the lesson will focus.
- Compare and contrast
- Category formation
- Concrete everyday examples
- Understand
- DOK 1 to 2
- Side-by-side comparison cards
- Short, parallel bullet lists
- Familiar examples
Where Charge Comes From
To understand electricity, you have to go very small. All matter is made of atoms, and inside every atom are the charged particles that electricity depends on.
In the middle of each atom is a nucleus. The nucleus holds two kinds of tiny particles: protons and neutrons. Orbiting around the nucleus are even smaller particles called electrons.
Each particle carries a different charge. Charge is what makes electricity possible.
- Locate charge inside the atom.
- Set up electrons as the particles that move.
- Builds on the supporting idea of atomic structure
- Dual coding with the atom diagram
- Organized comparison table
- Remember to Understand
- DOK 1 to 2
- Labeled diagram paired with text
- Simple charge table
- Key terms defined in place
Neutral, Positive, or Negative?
An object's overall charge depends on one simple count: how many protons it has compared to how many electrons. Move electrons, and you change the charge.
When the number of protons in an atom equals the number of electrons, the positive and negative charges cancel out. The atom has no overall charge, so it is neutral. For example, 2 protons (+) and 2 electrons (-) add up to no charge.
Friction can cause electrons to be transferred from one object to another. When you rub two materials together, electrons move. This creates an imbalance of positive and negative charges, and that imbalance is static electricity.
An atom that loses electrons now has more positive protons than negative electrons. With more '+' than '-', the object is positively charged.
An atom that gains electrons now has more negative electrons than positive protons. With more '-' than '+', the object is negatively charged.
- Explain how objects become charged.
- Correct the common idea that protons move.
- Misconception checking
- Cause-and-effect modeling
- Dual coding with charged-object diagram
- Understand to Apply
- DOK 2
- Key terms defined in place
- Counting model (plus vs minus)
- Short paragraphs paired with a diagram
Attract or Repel?
Once objects are charged, they push and pull on each other with an electric force. Three simple rules predict what will happen. Click a pairing to see the result.
Law 1: Opposite charges (a + and a -) attract, pulling toward each other. Law 2: Like charges (two + or two -) repel, pushing apart. Law 3: A neutral object is attracted to both positive and negative objects.
- Give students rules to predict attraction and repulsion.
- Introduce how charge size and distance change force strength.
- Rule-based prediction
- Interactive dual coding
- Cause-and-effect (charge and distance to force)
- Understand to Analyze
- DOK 2 to 3
- Click to reveal each pairing, no hover
- Large click targets
- Plain statement of each rule
Which Way Do Electrons Move?
When you rub two materials together, electrons move from one to the other. But which way? Scientists made a list, called the electrostatic series, that predicts it.
The electrostatic series ranks materials by how tightly they hold their electrons. As you go down the list, materials hold their electrons more strongly. Materials higher on the list give up their electrons to materials lower on the list when the two are rubbed together.
- Show that electron transfer is predictable.
- Connect the series back to charging by friction.
- Worked example (balloon and hair)
- Organized reference table
- Elaboration on prior section
- Apply to Analyze
- DOK 2 to 3
- Ranked table with clear ends labeled
- One concrete, familiar example
- Short reading load
When Charge Jumps the Gap
Built-up charge does not stay forever. When enough charge collects, it can leap across the air to balance out. That sudden jump is a discharge, and it is the answer to our opening question.
If there are enough positive charges on one object and enough negative charges on the surface of another, the electrons can jump the air gap between them. That jump is a spark.
This is what happens when you touch metal and feel a shock. The charge that built up on you discharges to the doorknob, even before you fully touch it.
- Resolve the opening phenomenon.
- Show forces acting across a gap, with no contact.
- Closing the curiosity loop
- Scaling from small (spark) to large (lightning)
- Dual coding with the lightning diagram
- Understand to Analyze
- DOK 2 to 3
- Familiar event explained plainly
- Labeled diagram paired with text
- Connects new term to a known image
Brain Check
Three quick questions before we put it all together. These are not graded. Pulling answers from memory now will help them stick.
- Strengthen memory through retrieval before the wrap-up.
- Surface misconceptions early.
- Retrieval practice
- Generation effect
- Productive struggle
- Understand to Apply
- DOK 1 to 2
- Ungraded and low stakes
- Immediate feedback
- Short tasks reduce load
From Carpet to Lightning
You started with a question: why do you get a shock after walking across a carpet, and what does that have to do with lightning? Now you can trace the whole chain, step by step.
- Tie the pieces into one cause-and-effect chain.
- Answer the opening question directly.
- Schema building
- Elaboration
- Coherent narrative
- Understand to Analyze
- DOK 3
- Step-by-step beats
- Plain causal language
- Builds on prior sections
Check Your Understanding
Ten questions covering everything you explored, from static and current electricity to the law of electric charges. Answer every question, then submit.
Scientists don't just know the answer. They explain their thinking.
Write your own explanation first. Then submit your work to compare your thinking with a model answer.
In one or two sentences, explain how dragging your feet across a carpet can lead to a shock that jumps to a doorknob before you even touch it. Trace what the electrons do, from the carpet to the spark. Use the word electrons.
- End the lesson with the student constructing the causal chain in their own words, not selecting it.
- Give the one place where the student generates rather than clicks.
- Generation effect and self-explanation
- Cause-and-effect: tracing electrons from friction to discharge
- Self-check reveal for comparison, ungraded
- Analyze to Evaluate
- DOK 3
- Sentence-length response, not an essay
- Keyword scaffold ("electrons")
- Model answer to compare against
- Check understanding against the lesson goals.
- Give students and teachers a clear signal.
- Retrieval practice
- Feedback loops
- Understand to Apply
- DOK 1 to 2
- Answer explanations provided
- Practice and classroom modes
- Plausible, evenly placed options
More Learning
The lesson is just the beginning. Dig deeper into static electricity, current electricity, and the law of electric charges that explains sparks and lightning. More investigations, simulations, and challenges are coming soon.
- Offer pathways beyond the core lesson.
- Signal that learning continues past the quiz.
- Interest-driven extension
- Transfer to new contexts
- Apply to Analyze
- DOK 2 to 3
- Optional and self-paced
- Clear labels for what is available
- No penalty for skipping
Connections
Electricity is energy you can switch on and send through a wire. These lessons show where that energy comes from and what it becomes.