Question

☯ Hello Answerers! A fresh new set of questions are now ready for you. ☯
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☯ Subject- Physics ☯
☯ Chapter- Electricity ☯
☯ Standard- 8 ☯
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QUESTIONS:-

1.State two importance of insulators in electrical circuits and equipment.Answer in bullets with proper subheadings. ✍

2. Explain the conditions under which a bulb glows when it is connected by wires to a cell. Explain each condition in about 2 sentences with bullets. ✍

3. How should a bulb, a cell and a wire be connected so that the bulb glows? Attach a diagram too. ✍

4. State the functions of a switch. Answer in bullets. Write at least 4-5 points. ✍
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✳ NOTE ✳

◆Do not mention about electrons anywhere in these answers.
◆No Spam or Palgarism allowed.

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Answer 1

Answer: (｡◕‿◕｡)➜(｡◕‿◕｡)➜

Importance of insulators in electrical circuits:-

• Insulator is usually used to insulate the live parts of equipment or cable from earthed objects.
• Insulators are used for insulation of wire, switches, plugs, etc. So that circuit could be made shock free and safe to touch.

The conditions under which a bulb glows when it is connected by wires to a cell:-

• The filament has to be hot enough to glow.
• The filament should not melt or break.
• The glass enclosing the filament should have low absorption cross-section to the wavelength in which the filament is supposed to radiate light, that way maximizing light output from the bulb.
• The circuit should be closed.
• The connecting wire should be made of conducting material like Copper.
• The circuit should have a power source like battery.

Arrangement of a bulb, a cell and a wire be connected to make the bulb glows:-

The two terminals of the electric cell were connected to two terminals of the bulb.

The functions of a switch:-

• The function of a switch is to either open or close a conductive path.
• It is used to control the flow of current though a circuit.
• Less power consumption (if circuit is not used at that time you can simply turn OFF the switch so, power consumption of circuit becomes 0).
• Better control over circuit.