10 Questions
Which materials allow electricity to flow through them easily?
Metals
What is the only non-metal that is a good conductor of electricity?
Graphite
What is used to protect from the dangerous effects of electricity?
Insulators
What provides a form of energy called 'electrical energy'?
Electricity
Which is one of the most efficient, pollution-free, and useful forms of energy?
Electrical energy
What causes the bulb in an electric tester to glow?
Heating effect of current
Why should the free ends of the electric tester not be joined for an extended period?
To prevent the cell or battery from draining quickly
What happens when the current through a circuit is too weak?
The filament does not get heated sufficiently and the bulb does not glow
What is the function of a magnetic compass in an electric tester?
Acting as a current detector
What does LED stand for in the context of the electric tester?
Emitting Diode
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.
Test your knowledge about electricity with this quiz! From conductors and insulators to understanding electrical energy, this quiz covers the essentials of this essential form of energy.
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