Re: HP48GX/49G/+/50G woking with lists

On Wed, 13 May 2009 12:52:13 -0400, Harold A. Climer
<Harold-Climer@xxxxxxx> wrote:

This week the students in my Electricity and Magnetism Lab
did an experiment to study how resistance of a Metal changes with
temperature. We used a light bulb(Tungsten filament) Power Supply, a
Voltage and Current sensor and plotted a graph of voltage vs. current.
Using the Raw data a resistance was calculated using Ohm's law. From
the resistance they were able to calculate a Temperature using the
following equation:
Rt= Ro(1+a(T-To))
Rt: Resistance at Temperature T
Ro: Resistance at room Temperature approx. 20 Degrees C
a: Tungsten Temperature coefficient 4.5 E -3 K^-1
To :Room Temperature 20 Degrees C

Question: is it possible to put the Voltage and Current data in two
lists an multiply the lists together to get a list of resistances?
If that is possible, is it possible to apply the above equation and
solve for a list of temperatures. By this I mean apply the equation to
the list of resistances and get a list of temperatures back.
I have done all this by hand to check their work. I calculated the
resistance and used the solver to find T.
I do not know why I didn't think about list calculations before.
Harold A. Climer
Dept Of Physics Geology & Astronomy
U.T. Chattanooga
Room 406A Engineering,Math & Computer Sicence Building
615 McCallie Ave.
Chattanooga TN 37403
Harold-Climer@xxxxxxx

Thanks for your help. I was trying to save some steps in the process.
I tell my student all the time that a correct program to do repetitive
tasks saves time and reduces errors. I guess I should follow my own
advice more often
Harold A Climer
Dept. Of Physics Geology, and Astronomy
U.T, Chattanooga
Rm. 406A Engineering, Math & Computer Science Building
615 McCallie Ave. Chattanooga TN 37403
Harold-Cimer@xxxxxxx
.

Relevant Pages

  • Re: Electrolysing Steam
    ... >> temperature, and a tunnel diode exhibits a reduction in resistance as ... >> he was working with was a function of temperature hence voltage, ... I very much doubt that Ohm was much ...
    (sci.energy.hydrogen)
  • Re: Electrolysing Steam
    ... >> temperature, and a tunnel diode exhibits a reduction in resistance as ... >> he was working with was a function of temperature hence voltage, ... I very much doubt that Ohm was much ...
    (sci.energy)
  • HP48GX/49G/+/50G woking with lists
    ... Using the Raw data a resistance was calculated using Ohm's law. ... the resistance they were able to calculate a Temperature using the ... Resistance at room Temperature approx. ... lists an multiply the lists together to get a list of resistances? ...
    (comp.sys.hp48)
  • Re: 20mA current loop
    ... This voltage signal needs to be ... so that the voltage drop in the wire is low compared to the drop ... the resistance of the meter movement as temperature varies. ...
    (sci.electronics.design)
  • Re: HP48GX/49G/+/50G woking with lists
    ... Voltage and Current sensor and plotted a graph of voltage vs. current. ... Using the Raw data a resistance was calculated using Ohm's law. ... the resistance they were able to calculate a Temperature using the ... lists an multiply the lists together to get a list of resistances? ...
    (comp.sys.hp48)
Loading