Flashlight
A flashlight (in American English) or torch (in Commonwealth countries) is a small, portable spotlight. Its function is a beam of light which helps to see. It u…
.jpg)
A flashlight (in American English) or torch (in Commonwealth countries) is a small, portable spotlight. Its function is a beam of light which helps to see. It usually requires batteries.
The light is made by a small light bulb. In the 20th century, it was usually an incandescent bulb. Nowadays most use LEDs, which work slightly differently. In 1896, the first dry cell battery was invented. Unlike previous batteries, it used a paste electrolyte instead of a liquid. This was the first battery suitable for portable electrical devices, as it did not spill or break easily and worked in any orientation. Sometimes the electricity comes from a small generator instead of a battery.
The torch can also refer to a flammable stick that is lit on fire to provide light and (or) heat.
Origin
Hundreds of years ago, people used candles or oil lamps for indoor light. Candles were expensive, and once the candle was gone, you would have to buy or make a new one or be stuck in the dark. When electricity was discovered and the light bulb was invented, David Misell, a British man working in Hubert's New York shop in 1898, came up with the idea of a light bulb that you could take with you, anywhere you wanted to go. Then, the torch was invented. The first flashlight has three D batteries which powered a small incandescent bulb. The bulbs would glow with a simple ON/OFF switch.[1]
References
- ↑ "When Were Flashlights Invented?". 2020-08-31. Archived from the original on 2020-10-01. Retrieved 2020-09-10.
Content Disclaimer
Informasi ini disarikan dari Wikipedia dan disajikan kembali untuk tujuan edukasi. Konten tersedia di bawah lisensi CC BY-SA 3.0. Kami tidak bertanggung jawab atas ketidakakuratan data yang bersumber dari kontribusi publik tersebut.
- The information displayed on this website is sourced in part or in whole from Wikipedia and has been adapted for the purpose of restating it. We strive to provide accurate and relevant information, however:
- There is no guarantee of absolute accuracy. Wikipedia is an open, collaborative project that can be edited by anyone, so information is subject to change.
- It is not intended to constitute professional advice. The content displayed is for informational and educational purposes only. For important decisions (e.g., medical, legal, or financial), please consult a professional.
- Content copyright. Wikipedia is licensed under the Creative Commons Attribution-ShareAlike License (CC BY-SA). This means that content may be reused with appropriate attribution and shared under a similar license.
- Responsible use. Any risk arising from the use of information from this website is entirely the responsibility of the user.