8. Is air a good or a bad conductor of electricity? [3 marks]
Yea
9. Give some uses of conductors and insulators. [3 marks
Answers
Explanation:
Air does not conduct electricity in the way that metals do. We normally think of conductors as metals with free electrons that move easily throughout the whole metal. So with large voltages it is possible to generate electrons that can move freely in a gas and conduct electricity - as in the example of lightning.
Answer 1→ Air is a poor conductor of electricity, but under certain specific conditions, air could conduct anelectric current.
Answer 2→
Conductor:
• Iron is a common material used in vehicle engine manufacturing to conduct heat.
• Mercury is a common material in thermometer to check the temperature of the body.
Insulator:
• Rubber is a common material used in making tyres, fire-resistant clothes and slippers. This is because it is a very good insulator.
• Thermal insulators, disallow heat to move from one place to another. Hence, we use them in making thermoplastic bottles. They are also used in fireproofing ceilings and walls.
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