You can make your own electric lamp and get a bright, though brief, glow.
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Material :
Two nails
A short length of thin iron wire(a strand of picture frame wire)
An ordinary bottle or jar
A cork to fit the bottle
Four dry cell batteries
A length of covered copper wire
Procedure :
- Stick the two nails through the cork
- Attach the iron wire to the nail points
- Fit the cork into the neck of the bottle, allowing the nail heads to remain outside and the iron wire to go inside
- With the covered wire, connect the dry cells to the heads of the nails
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That's it.The procedure is done.
You will see that :
The thin iron wire gets hot enough to glow and you have made an electric lamp of the bottle. However, the iron wire gets so hot that it burns in the air of the bottle. The iron breaks and the lamp goes out.
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Explanation :
In our modern electric lamp, nitrogen (which doesn’t sup- port burning) is substituted for the air within the bulb. Tungsten is used for the inner (filament) wire because this metal can get white hot and glow without melting. Since it
requires less heat to make a thin wire glow, an extremely thin tungsten wire is used.
