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Electric current

Lesson 6 / 8

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Lesson details

Lesson outcome

Waxaan qeexi karaa sida unuggu (cell) u keeno qulqulka korontada wareegga iyo sida elektaroonnadu u dhaqaaqaan.

Introduction

In this lesson: I can describe how a cell causes current in a circuit and explain the movement of electrons. One end of a battery has a positive charge and one end has a negative charge, because of chemical reactions inside it. A battery pushes electric charge (electrons) one way round a complete circuit.

Show transcript
One end of a battery has a positive charge and one end has a negative charge, because of chemical reactions inside it. A battery pushes electric charge (electrons) one way round a complete circuit. There are electric charges in all atoms of the wires and components in a circuit, even when it is not turned on. When a circuit is turned on, electrons everywhere in the circuit start moving at the same time. Individual electrons move round a circuit slowly, at a speed of just a few millimetres each second.

Worksheet

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Quizzes

  1. 1. In which circuit will the bulb light?

    • a black and white drawing of a light bulb attached to a light switch with a cord connected to it
    • a black and white drawing of a light bulb attached to a wall light with a cord attached to it
    • Correct answer:a black and white drawing of a mailbox with a light on top of it and a light bulb in the middle of the box
    • a black and white drawing of a cord connected to a light bulb with a switch on the side of the cord

  2. 2. A motor is connected to a cell and spins. Which of the following would cause the motor to spin faster?

    • adding a bulb to the series circuit
    • adding a switch to the series circuit
    • adding another motor to the series circuit
    • Correct answer:adding another cell to the series circuit

  3. 3. What mistake has been made in this circuit diagram?

    • The switch is open.
    • The motor is before the switch.
    • The ammeter should be beside the motor.
    • Correct answer:The battery is not connected to the lead.

  4. 4. Which component is represented by the circuit symbol shown?

    • a lamp
    • a motor
    • Correct answer:a buzzer
    • a resistor

  5. 5. Which of the following statements describe ways to fix a faulty circuit?

    • disconnecting all the components and reconnecting them
    • changing the direction of the cells
    • Correct answer:testing each component with a test circuit
    • Correct answer:replacing each component, one by one, with a working one
    • switching the circuit off and then on again

  6. 6. Why are there certain rules for drawing circuit diagrams?

    • Correct answer:so that scientists and engineers around the world can understand them
    • to make them look nicer
    • so they are easy to mark in exams
    • to make them more professional looking

  1. 1. Which of the following statements about the terminals of a cell is correct?

    • Correct answer:A cell has one positive terminal and one negative terminal.
    • A cell has two positive terminals.
    • A cell has two negative terminals.
    • A cell has a neutral terminal and either a positive or a negative terminal.

  2. 2. What is inside a cell that pushes the electric charges round a circuit?

    • small magnets
    • mini pumps
    • microscopic motors
    • Correct answer:chemicals that react

  3. 3. What is the name of the moving charges that carry electric current through a metal wire?

    • protons
    • Correct answer:electrons
    • magnetrons
    • neutrons

  4. 4. What is the normal speed of electrons flowing through a metal wire?

    • Correct answer:a few millimetres per second
    • a few metres per second
    • a few kilometres per second
    • a few million metres per second

  5. 5. Which of the following objects can be used to make a simple cell?

    • two pieces of the same metal, liquid oil and some wires
    • two pieces of the same metal, a weak acid solution and some wires
    • two different metals, liquid oil and some wires
    • Correct answer:two different metals, a weak acid solution and some wires

  6. 6. Which two of these objects have free electrons that can carry an electric current?

    • plastic ruler
    • Correct answer:copper wires
    • air in the room
    • Correct answer:steel paperclips
    • wooden pencil

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 · 6 questions
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