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Lamp and tugsten

  • Thread starter Gyroscope
  • Start date
Gyroscope
1. Homework Statement

[tex]p_t=p_{20}(1+\alpha (t-20))[/tex]

I have a circuit with a 3,5 V lamp that has a tungsten filament. I can provide to the circuit a variable voltage. How would I find the melting temperature of tungsten?

I know p_20 and alpha and the voltage I provide. And I have an device to measure current too.

Could I just increase voltage until the lamp turns off (which means the tungsten filament melted), measure the current and by means of Ohm's Law I could find the resistance. And then with the initial formula, I could find the temperature to which corresponds this resistance.

Am i right? Sorry my poor English.
 
Last edited by a moderator:

Answers and Replies

Gyroscope
knock, knock...

Sorry to reply to my own thread, but I have some urgence to solve this, please, please...
 
brewnog
Science Advisor
Gold Member
2,701
7
If you're expecting to have homework problems solved for you within 2 hours, then you're probably at the wrong place.

What happens if you follow up on your original reasoning? Also how are your terms defined?
 
Gyroscope
You are totally right. I am sorry...
 

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