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Electrical resistance

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Lesson details

Lesson outcome

Waxaan isbarbardhigi karaa iska caabbinta korantada ee qaybaha kala duwan iyadoo la adeegsanayo cabbirada xoogga korontada (current).

Introduction

In this lesson: I can compare the electrical resistance of different components using measurements of current. An ammeter measures current in amps (A). Resistance is a measure of how difficult it is for a current to flow.

Show transcript
An ammeter measures current in amps (A). Resistance is a measure of how difficult it is for a current to flow. Resistance is measured in ohms (Ω). In a fair test, only the independent variable is changed so that no other variables affect the results. The variables that are deliberately kept the same are called control variables.

Worksheet

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Quizzes

  1. 1. Which of the following is not a good conductor of electricity?

    • gold
    • silver
    • Correct answer:plastic
    • copper

  2. 2. Which of the following is the term given to materials that do not conduct electricity?

    • convectors
    • consultors
    • insultors
    • Correct answer:insulators

  3. 3. Which of the following components is represented by the circuit symbol shown?

    • lamp
    • voltmeter
    • buzzer
    • Correct answer:resistor

  4. 4. Which of the following components is represented by the circuit symbol shown?

    • Correct answer:lamp
    • ammeter
    • voltmeter
    • motor

  5. 5. Which of the following components is not represented by the circuit symbols shown?

    • battery
    • Correct answer:ammeter
    • buzzer
    • lamp
    • motor

  6. 6. Which of the following will happen if you add more lamps in series to a series circuit with one lamp?

    • The lamps stay the same brightness.
    • Correct answer:The lamps get dimmer.
    • The lamps get brighter.
    • The original lamp stays the same brightness but the new lamps are dimmer.

  1. 1. Which of the following is the correct unit for a measurement from an ammeter?

    • ohms
    • Correct answer:amps
    • volts
    • metres

  2. 2. Which of the following is the correct unit for resistance?

    • Correct answer:ohms
    • volts
    • amps
    • farads

  3. 3. Why does a resistor, such as the one shown, have coloured stripes on it?

    • To make it easy to see.
    • To show it is a resistor.
    • Correct answer:To show its resistance.
    • To show its date of manufacture.

  4. 4. An identical resistor is added in series to the circuit shown. Which of the following will happen?

    • Correct answer:The resistance increases and the current decreases.
    • The resistance decreases and the current decreases.
    • The resistance increases and the current increases.
    • The resistance decreases and the current increases.

  5. 5. When the circuit shown is switched on, in which of the following orders will the lamps light up?

    • First 1, then 2 and then 3.
    • First 1 and 3, and then 2.
    • First 3, then 2 and then 1.
    • Correct answer:1, 2 and 3 at the same time.

  6. 6. Which of the following statements correctly describes the brightness of the lamps in the circuit shown? Assume the lamps are identical.

    • 1 and 3 are brighter than 2.
    • 1 and 3 are dimmer than 2.
    • 1 is the brightest, followed by 2, and 3 is the dimmest.
    • Correct answer:They are all equally bright.

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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