# This Question is due in 2 Hours Please Help

1. Feb 6, 2009

### wayneinsane

A common flashlight bulb is rated at 0.200 A and 3.80 V (the values of current and voltage under operating conditions). If the resistance of the bulb's tungsten filament at room temperature (20.0°C) is 1.10 , estimate the temperature of the tungsten filament when the bulb is turned on.

2. Feb 6, 2009

### LowlyPion

Re: This Question is due in 2 Hours... Please Help!!

Please make an attempt to solve the problem and maybe someone will help.

3. Feb 6, 2009

### wayneinsane

Re: This Question is due in 2 Hours... Please Help!!

Well... what I've tried to do was find the resistance which is R=E/I and I got 3.8/.2 = 19... then I divided that by 1.10 and got 17.27.... someone told me to look up in a tungsten chart the value of the new temperature but the chart gives approximations. I've tried 3 attempts, I have 1 left so I can't make anymore approximations... I was wondering if anyone knew a way to find the correct temperature

4. Feb 6, 2009