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Static electricity: charge

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Lesson outcome

Waxaan qeexi karaa waxa danabku yahay iyo sida loogu wareejiyo walxaha qaarkood, iyagoo siinaya danab iska soo horjeeda.

Introduction

In this lesson: I can describe what charges are and how they are transferred between some objects, giving them opposite charges. Atoms contain positive and negative electric charges. The particles in atoms with a negative electric charge are called electrons.

Show transcript
Atoms contain positive and negative electric charges. The particles in atoms with a negative electric charge are called electrons. Electrons can sometimes be transferred from one object to another, depending on the materials the objects are made of. Metals are difficult to charge because electric charge flows through them, preventing charge from building up. When static electricity builds up, it can be useful but also problematic.

Worksheet

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Quizzes

  1. 1. In which of the following examples could you find static charge building up?

    • Correct answer:car tyres rubbing on the road
    • Correct answer:rubbing a cloth on a piece of plastic
    • mains electricity lighting a bulb
    • Correct answer:walking on a carpet with rubber soled shoes

  2. 2. What is the charge shown on the balloon?

    • positive
    • neutral
    • Correct answer:negative

  3. 3. A ruler and a balloon both have a positive charge. Which of the following will happen as the ruler is brought closer to the balloon?

    • They will attract more strongly.
    • They will attract more weakly.
    • They will repel more weakly.
    • Correct answer:They will repel more strongly.

  4. 4. The balloons shown both have a negative charge. Which of the following will the balloons do when brought close to each other?

    • attract
    • Correct answer:repel
    • move up
    • move down

  5. 5. Which of the following explains why the balloon shown sticks to the wall?

    • Correct answer:The positive and negative charges attract.
    • The balloon contains helium.
    • The rubber of the balloon is sticky.
    • Friction between the wall and the balloon keeps it in place.

  6. 6. Which of the following explains why static charge does not build up in normal circuits?

    • There is a different type of charge in electrical circuits.
    • The circuits are not rubbed.
    • The electrons carry away the charge.
    • Correct answer:Charge is able to flow away through conducting wires.

  1. 1. A neutral object is rubbed and becomes positively charged. Which of the following is the correct explanation for this?

    • The object gains negative charges.
    • Correct answer:The object loses negative charges.
    • The object gains positive charges.
    • The object loses positive charges.

  2. 2. Which of the following correctly explains why is it difficult to charge an object that is made of metal?

    • Metals do not have electrons.
    • Correct answer:Electrons flow easily through metal, so charge cannot build up in one place.
    • Electrons are more strongly attached to atoms in metals than in other materials.
    • A metal always gains or loses the same number of positive and negative charges.

  3. 3. Which of the following statements is correct for a neutral object?

    • The object must be an insulator.
    • The object must be a conductor.
    • The object contains no electrons or nuclei.
    • The object contains nuclei but no electrons.
    • Correct answer:The object contains equal amounts of positive and negative charge.

  4. 4. A Van der Graaf generator has a moving rubber belt which becomes charged by friction. The charge is transferred to a metal dome. Why can the dome become charged, even though it is made of metal?

    • Correct answer:The dome’s support is plastic, which is an insulator.
    • The dome’s support also becomes charged.
    • The dome’s support is metal, which allows charge to keep flowing to the dome.

  5. 5. A person puts their finger near the dome of a negatively charged Van der Graaf generator. A spark travels between their finger and the dome. Which of the following statements correctly explain why?

    • Atoms travel between the person and the dome.
    • Nuclei travel between the person and the dome.
    • Correct answer:Electrons travel between the person and the dome.
    • Correct answer:A current flows between the person and the dome.

What pupils see

The same lesson as a pupil sees it. You can set any section as work on its own.

  • IntroductionPrepare
  • Starter quizActivate · 6 questions
  • Lesson videoLearn
  • Exit quizCheck · 5 questions
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