Thickness of a wire
Lesson 2 / 9
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Waxaan sharxi karaa sida batterigu u riixo xoogga korontada iyadoo loo marayo fiilooyin dhumuc kala duwan leh.
Introduction
In this lesson: I can describe how a battery pushes current through wires of different thicknesses. The thicker a wire, the smaller its resistance. The greater the cross–sectional area of a wire, the smaller its resistance.
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Quizzes
1. Which two of the following statements about electricity are correct?
- Correct answer:Metals are good conductors of electricity.
- Plastics are good conductors of electricity.
- Metals are good insulators of electricity.
- Correct answer:Plastics are good insulators of electricity.
2. In a fair test, the variable(s) that need to be kept the same are called ...
- the independent variable.
- the dependent variable.
- Correct answer:control variables.
3. Which of the following will happen if another battery is added (correctly aligned and in series) to the circuit shown?
- The current will decrease.
- The voltage will stay the same.
- The resistance will increase.
- Correct answer:The number of charge carriers in the wires will stay the same.
4. Which of the following will happen if two identical batteries are connected in series with a lamp, but aligned in opposite directions?
- Correct answer:The lamp won't light.
- The lamp will be brighter.
- The lamp will be the same brightness as it was with one battery.
- The lamp will flicker on and off.
5. Which of the following resistors will oppose the flow of current the most?
- 5 ohm resistor
- 10 ohm resistor
- 15 ohm resistor
- Correct answer:20 ohm resistor
6. Which of the following will happen if a resistor in a series circuit is moved closer to the battery?
- It will oppose the flow of current more.
- It will oppose the flow of current less.
- The nearer the battery a resistor is, the higher its resistance.
- Correct answer:There will be no effect on its resistance.
1. Which two of the following statements explain what will happen to a metal atom when it loses an electron?
- It becomes negatively charged.
- Correct answer:It becomes positively charged.
- It stays neutral.
- Correct answer:It becomes an ion.
2. Which two of the following metals are the best conductors of electricity?
- Correct answer:copper
- steel
- nichrome
- Correct answer:silver
- constantan
3. Which of the following statements explain why a thinner metal wire has a higher resistance than a thicker one, per metre?
- Correct answer:It has fewer electrons, per metre, to carry a current.
- It is harder for the electrons to squeeze though the narrow space.
- It has a greater cross–sectional area.
- Making it thinner causes the electrons to stay closer to the atoms.
4. The image shown is a representation of the arrangement of the particles in a metal. Which of the following particles do the small, blue spheres represent?
- protons
- neutrons
- Correct answer:electrons
- atoms
5. Which of the following statements explain why models are useful when describing electricity?
- Correct answer:They simplify complex ideas.
- They are exactly like the real thing.
- Correct answer:They use examples we are familiar with to help us understand abstract concepts.
- Correct answer:They help us visualise phenomena that we cannot directly observe.
6. Which of the following statements explains what will happen to the resistance and the current carried by a wire if its cross–sectional area is increased?
- Its resistance increases so the current carried also increases.
- Its resistance increases so the current carried decreases.
- Correct answer:Its resistance decreases so the current carried increases.
- Its resistance decreases so the current carried also decreases.
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