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Everyday Physics · Explain a mechanism step by step and use cause and effect to explain why static shocks happen more often in cold, dry weather

Why Do You Get Static Shocks in Winter?

Shuffle across a carpet, touch a doorknob, snap! Follow the electrons step by step and explain why static shocks are more common in dry winter air.

Suggested Grades 3–5614 core-passage words20 questions
A tiny static spark between a fingertip and a doorknob.
Static charge can discharge when touching metal; AI-generated illustration, with the spark exaggerated slightly for visibility. Generation provenance
What you’ll practiseDescribe atoms' positive and negative charges, explain in three steps how a static shock happens, use cause and effect to explain why dry winter air makes shocks more common, and compare a static shock with lightning.

Device/browser voice. Pronunciation and availability vary.

Snap!

On a cold January morning, you shuffle across the living-room carpet in your socks and reach for the metal doorknob. Snap! You feel a tiny sting in your fingertip. On a warm, sticky day in July, the same walk often gives a much smaller shock, or none that you notice.

That sting is caused by static electricity. To understand it, we need to follow something far too small to see, step by step, from the carpet to your finger to the doorknob.[1]

Tiny charges inside everything

Everything around you is made of atoms. Atoms contain even smaller parts. Protons have a positive charge, electrons have a negative charge, and neutrons have no charge. Usually an object has the same number of positive and negative charges, so the charges balance out.

Electrons can move from one thing to another fairly easily. When an object gains extra electrons or loses some, its charges are no longer balanced. Static electricity builds up when charges are unbalanced. Things with opposite charges are always attracted to each other.[1]

Step 1: Rubbing moves electrons

Science World, a science centre in Vancouver, explains a famous demonstration. When you rub a balloon on your head, electrons move from your hair onto the balloon. Electrons are negative, so the balloon becomes negatively charged and your hair is left with a positive charge. The balloon and hair now attract each other.

Each strand of hair has the same kind of charge, and like charges repel. That is why the strands push away from each other and stand up. Science World points out that rubbing does not make the charge. It just brings more of the two surfaces into contact, so more electrons can move across.[2]

Step 2: The charge builds up on you

The carpet works like the balloon, but in the other direction. When you scuff your feet across a rug, you pick up extra electrons from it. Each step adds more. Now your body has more negative charge than positive charge, so you have a negative charge.

You cannot feel the charge while it sits on you. It stays there until it finds an easy way to leave.[1]

Step 3: The jump

Electrons move more easily through some materials, such as metal. Scientists call these materials conductors. When your fingertip gets very close to a metal doorknob, the extra electrons jump across the tiny gap of air to the metal all at once.

Millions of electrons rushing across the gap make the snap you feel. Science World describes a shock as gaining or losing electric charge in a hurry. After the jump, your charges are balanced again, so a second touch usually does nothing until you build up a new charge.[1]

Why winter makes it worse

Static shocks happen more often in colder seasons because the air is drier. In dry air, electrons can build up on your skin more easily. In warmer, more humid weather, the moisture in the air helps electrons move off you more quickly, so not as much charge builds up.

People who run static demonstrations know this too. Science World notes that humidity in the air can make it hard to build up charges, so a balloon demonstration that works well on a dry, cool day may not work as well on a muggy one.[1]

A giant cousin: lightning

NOAA, a United States government science agency, says the shock from a doorknob is the same idea as lightning, only far bigger. Inside a thunderstorm cloud, strong up and down air currents separate charges. The bottom of the cloud becomes negatively charged and the top becomes positively charged.

Air normally keeps charges apart. When the charge becomes strong enough to overpower the air, a huge spark of lightning flashes across. Your doorknob spark is tiny and lasts only an instant, but both are charges escaping in a hurry.[3]

Explore the instructional diagram
A three-step schematic of a static shock: shuffling feet on a carpet pick up electrons, the extra electrons build up on the person as a negative charge, and the electrons jump from a fingertip to a metal doorknob as a small spark. Dry winter air lets charge build up more easily than humid air. How a static shock happens Simplified schematic · not to scale · each − stands for many electrons 1 · RUB2 · BUILD UP3 · JUMP feet on carpet pick upextra electrons the extra electronsstay on your body electrons jump tothe metal knob: snap! CARPET shuffle negative charge metal knob spark jumps Dry winter air: charge builds up · Humid air: charge leaks away
Simplified schematic, not to scale. Rubbing moves electrons onto you, the extra charge builds up, and it jumps to a metal conductor. Real electrons are far too small to see; each symbol stands for a huge number of them.

Fast lesson

Use these checks before you answer the practice questions.

Follow the electrons

Ask your child to point to the diagram and say where the extra electrons are at each step: on the carpet, on you, then on the doorknob. Most questions can be answered by tracing that path.

Rubbing is not making

A common idea is that rubbing creates electricity. The article says rubbing only brings surfaces into contact so electrons can move. Ask: where did the electrons come from before they reached you?

Cause and effect with a missing link

For 'Why winter makes it worse', practise building a chain with a middle step: dry air → charge builds up more easily → more shocks. Ask your child to name the middle link out loud.

Common mistakes

Thinking the doorknob shocks you.

Why this fails: The extra charge is on you. The metal doorknob is simply an easy path for the electrons to jump to.

Thinking rubbing creates electricity.

Why this fails: Science World explains that rubbing only brings more surface into contact so that existing electrons can move across.

Thinking cold itself causes the shocks.

Why this fails: The article says the cause is dry air. Moisture in humid air helps electrons move off you, so less charge builds up.

Word Lab

Use the meaning, hear the word, then try it in your own sentence.

static electricity

noun phrase

electric charge that builds up on an object instead of flowing steadily

Static electricity can make your hair stand up.

atom

noun

one of the tiny particles that everything is made of

A balloon is made of billions of atoms.

electron

noun

a tiny part of an atom that has a negative charge and can move from one thing to another

Electrons moved from the carpet to my socks.

proton

noun

a tiny part of an atom that has a positive charge

A proton has a positive charge.

neutron

noun

a tiny part of an atom that has no charge

Neutrons have no electric charge.

charge

noun

an amount of electricity that something carries; it can be positive or negative

After I rubbed the balloon, it had a negative charge.

attract

verb

to pull toward

Opposite charges attract each other.

repel

verb

to push away

Like charges repel, so the hairs spread apart.

conductor

noun

a material that electricity moves through easily, such as metal

The metal doorknob is a good conductor.

humid

adjective

having a lot of water vapour in the air

On humid days, static shocks are less common.

spark

noun

a tiny flash of light made when electric charge jumps across a gap

A tiny spark jumped from my finger to the doorknob.

mechanism

noun

the steps that explain how something happens

The article explains the mechanism of a static shock.

Check your understanding

Choose an answer, explain your choice, and then check. Hints and retries are welcome.

Main idea1. What is the main idea of the article?
Show answer and explanation

Answer: Rubbing moves extra electrons onto you, and they jump to metal in a quick shock; dry winter air lets more charge build up.. The article follows electrons from the carpet onto you and then to the metal, and explains why dry air makes it worse. The doorknob does not store electricity, the article does not call shocks dangerous, and Science World says rubbing does not make the charge; it just helps electrons move across.

Vocabulary in context2. In 'like charges repel', what does repel mean?
Show answer and explanation

Answer: Push away from each other. The strands with the same charge push away from each other and stand up, so repel means push away. Pulling together is what opposite charges do (attract). The other choices describe different events in the article.

Sequence3. Which order matches the article?
Show answer and explanation

Answer: You scuff your feet on the rug → extra electrons build up on you → they jump to the metal doorknob. Rubbing comes first, then the extra electrons build up on you, and finally they jump to the metal. The other orders make the jump happen before the build-up, or have electrons coming from the doorknob.

Try the questions here. Public practice does not save a learning record.

Support · Find it in the text

Support · Find it in the text practice

Each answer is stated in the article. Point to the sentence.

Locate

1. What are the three parts of an atom named in the article, and what charge does each have?

Locate

2. When you rub a balloon on your hair, which way do the electrons move?

Locate

3. What do scientists call materials, such as metal, that electrons move through easily?

Locate

4. What charge does your body have after you scuff your feet across a rug?

Locate

5. What does Science World say can make it hard to build up charges?

Locate

6. In a thunderstorm cloud, which part becomes negatively charged?

Apply · Explain the reason

Apply · Explain the reason practice

Use 'because' and a detail from the article.

Explain

7. Why do strands of hair stand up after you rub a balloon on your head?

Explain

8. Why does a rubbed balloon stick to your hair?

Explain

9. Why does the shock happen at a metal doorknob and not while you are walking?

Explain

10. Why might a balloon demonstration fail on a muggy summer day?

Explain

11. The article says rubbing does not make the charge. What does rubbing do instead?

Explain

12. Why does a second touch of the doorknob usually do nothing?

Reason · Order and compare

Reason · Order and compare practice

Put the mechanism in order, compare the steps and spot weak claims.

Sequence

13. Put these in order: electrons jump to the metal; you shuffle on the carpet; you feel a snap; extra electrons build up on you; your hand nears the doorknob.

Compare

14. Compare the balloon and the carpet. Which one gains electrons in each case?

Evaluate

15. A classmate says, 'The doorknob was full of electricity and zapped me.' What is wrong with this explanation?

Cause and effect

16. Complete the chain: dry winter air → ? → bigger chance of a shock.

Compare

17. Give one way lightning is like a doorknob shock and one way it is different.

Practice answer key

  1. 1. Protons are positive, electrons are negative and neutrons have no charge.
    They are listed in 'Tiny charges inside everything'.
  2. 2. From your hair onto the balloon.
    This is in 'Step 1: Rubbing moves electrons'.
  3. 3. Conductors.
    'Step 3: The jump' gives the word.
  4. 4. A negative charge.
    'Step 2' says you pick up extra electrons, so you have a negative charge.
  5. 5. Humidity in the air.
    It is in 'Why winter makes it worse'.
  6. 6. The bottom of the cloud.
    The lightning section says the bottom becomes negative and the top positive.
  7. 7. Because each strand has the same kind of charge, and like charges repel, so the strands push away from each other.
    'Step 1' explains this.
  8. 8. Because the balloon is negative and the hair is positive, and opposite charges attract.
    Combine 'Tiny charges inside everything' with 'Step 1'.
  9. 9. Because the extra electrons stay on you until they find an easy way to leave, and metal is a conductor that gives them that path.
    See the end of 'Step 2' and the start of 'Step 3'.
  10. 10. Because humidity makes it hard to build up charges; moisture helps electrons move away.
    Both ideas are in 'Why winter makes it worse'.
  11. 11. It brings more of the two surfaces into contact, so more electrons can move from one to the other.
    Science World makes this point in 'Step 1'.
  12. 12. Because after the jump your charges are balanced again, so there is no extra charge left to jump.
    This is the last sentence of 'Step 3'.
  13. 13. You shuffle on the carpet → extra electrons build up on you → your hand nears the doorknob → electrons jump to the metal → you feel a snap.
    The charge is picked up, stored, then released, and only then do you feel it.
  14. 14. With the balloon and hair, the balloon gains electrons. With the carpet and your feet, you gain electrons.
    The same rule works in both cases; only the direction of the electrons is different.
  15. 15. The extra charge was on the person, not on the doorknob. The electrons jumped from the person to the metal.
    Follow the direction of the electrons through the three steps.
  16. 16. Electrons can build up on your skin more easily, so more charge collects on you.
    The missing link is the build-up of charge.
  17. 17. Alike: charge builds up and escapes in a sudden spark. Different: lightning is far bigger, and its charges are separated by air currents in a cloud, not by rubbing on a carpet.
    The lightning section supports both parts.

Related skills

Why Do We See Lightning Before We Hear Thunder?Why Doesn't a Magnet Stick to Every Metal?Reading Library

Put it in your own words

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Check your own explanation

This is self-review, not automatic marking.

Compare with a model response

Everything is made of atoms, and atoms contain electrons, which have a negative charge and can move from one thing to another. When I shuffle my feet across a carpet, I pick up extra electrons from the rug. Rubbing does not make the electrons; it just helps them move across. Now my body has more negative charge than positive charge, and the extra electrons stay on me. When my finger gets close to a metal doorknob, the electrons jump across the tiny gap, because metal is a conductor. That sudden rush of electrons is the snap I feel. Shocks are more common in winter because the air is drier, so charge builds up on my skin more easily. In humid weather, moisture in the air helps electrons move off me before much charge can build up.

Sources and revision notes

Source check: 2026-10-27. Grade guidance is an editorial suggestion, not a standardised reading score.

  1. Nemours KidsHealth — Why Do I Get an Electric Shock? (published January 29, 2021)
  2. Science World (Vancouver) — Static Electricity (activity resource)
  3. NOAA National Environmental Satellite, Data, and Information Service — What Causes Lightning and Thunder? (August 27, 2025)
What changed in this edition?

The parts of the atom, picking up electrons from a rug, metal as a conductor, and the link between dry air in colder seasons and shocks come from Nemours KidsHealth. The balloon-and-hair demonstration, the point that rubbing increases contact rather than making charge, the description of a shock as charge moving in a hurry and the note that humidity makes charge hard to build up come from Science World. The comparison with lightning and the charge separation in storm clouds come from NOAA. The opening scene is an illustrative example, not a reported event. The diagram is a simplified schematic, not to scale.

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