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Questions and Answers
Which of the following is true about electrical appliances?
Which of the following is true about electrical appliances?
- Only large electrical appliances use cells.
- Some electrical appliances use cells, some use mains electricity, and some can work on cells or mains. (correct)
- All electrical appliances use mains electricity.
- Small electrical appliances use mains electricity and large ones use cells.
Why did Edison try 1600 different light bulbs?
Why did Edison try 1600 different light bulbs?
- To find the best material for making light bulbs. (correct)
- To create the first ever light bulb.
- To improve the efficiency of existing light bulbs.
- To demonstrate the versatility of electric lights.
What can be inferred from the information provided about electric lights?
What can be inferred from the information provided about electric lights?
- Electric lights work best in colder climates.
- Electric lights are so good to use because they are bright and last a long time. (correct)
- Electric lights are not as efficient as other types of lighting.
- Electric lights use a combination of cotton, wool, and coconut string to work efficiently.
Why is it mentioned that some electrical appliances can work on cells or mains?
Why is it mentioned that some electrical appliances can work on cells or mains?
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What is significant about the number 1600 in relation to Edison's work?
What is significant about the number 1600 in relation to Edison's work?
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What do we learn about electricity usage from the provided text?
What do we learn about electricity usage from the provided text?
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Study Notes
Electrical Appliances
- Electrical appliances can operate on cells or mains, indicating their versatility and adaptability.
Thomas Edison's Experiment
- Edison tried 1600 different light bulbs, demonstrating his perseverance and dedication to finding the perfect solution.
- The significance of 1600 lies in the fact that it represents the number of attempts Edison made to perfect his light bulb invention.
Electric Lights
- The development of electric lights implies a significant breakthrough in the field of electrical inventions.
Electricity Usage
- The text highlights the importance of understanding electricity usage, as it is a crucial aspect of modern life.
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