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Questions and Answers
Which materials allow electricity to flow through them easily?
Which materials allow electricity to flow through them easily?
- Metals (correct)
- Plastic
- Rubber
- Wood
What is the only non-metal that is a good conductor of electricity?
What is the only non-metal that is a good conductor of electricity?
- Wood
- Plastic
- Rubber
- Graphite (correct)
What is used to protect from the dangerous effects of electricity?
What is used to protect from the dangerous effects of electricity?
- Insulators (correct)
- Wood
- Metals
- Plastic
What provides a form of energy called 'electrical energy'?
What provides a form of energy called 'electrical energy'?
Which is one of the most efficient, pollution-free, and useful forms of energy?
Which is one of the most efficient, pollution-free, and useful forms of energy?
What causes the bulb in an electric tester to glow?
What causes the bulb in an electric tester to glow?
Why should the free ends of the electric tester not be joined for an extended period?
Why should the free ends of the electric tester not be joined for an extended period?
What happens when the current through a circuit is too weak?
What happens when the current through a circuit is too weak?
What is the function of a magnetic compass in an electric tester?
What is the function of a magnetic compass in an electric tester?
What does LED stand for in the context of the electric tester?
What does LED stand for in the context of the electric tester?
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Study Notes
Conductors of Electricity
- Materials that allow electricity to flow through them easily are called conductors.
- Metals are good conductors of electricity.
Non-Metal Conductors
- Carbon is the only non-metal that is a good conductor of electricity.
Electrical Safety
- Insulators are used to protect from the dangerous effects of electricity.
Electrical Energy
- Generators provide a form of energy called electrical energy.
Efficient Energy
- Electrical energy is one of the most efficient, pollution-free, and useful forms of energy.
Electric Testers
- The bulb in an electric tester glows when there is a flow of electricity.
- The free ends of the electric tester should not be joined for an extended period to prevent overheating.
- A weak current through a circuit can cause the bulb to glow faintly or not at all.
Magnetic Compass
- A magnetic compass in an electric tester is used to detect the presence of a magnetic field.
LED
- LED stands for Light-Emitting Diode in the context of the electric tester.
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