Click on the button above to view my Talon Talk!
Sorry if the audio quality is bad or if it is not loud enough. I don’t have much control over this.
Click on the button above to view my Talon Talk!
Sorry if the audio quality is bad or if it is not loud enough. I don’t have much control over this.
Hey Colin! Very nice presentation! I learned a lot about the relationship between resistance and temperature!
I think there was one small mistake on the slide where you were going to estimate the relationship between a given resistance and a given temperature using “the formula on the screen,” but the screen was black! Either way, I have learned so much about your presentation!
Just one question: How would the relationship between a valence band and a conduction band differ if there was more than one of one of the bands? Is that even possible?
Thank you for the learning experience,
Kavyan
Hey Kavyan,
Sorry about the blank screen, I didn’t realize that I was the only one that could see the image. I have updated the PowerPoint and you should be able to see the image now.
About your question, there is only one valence band and only one conduction band. However, there can be many electron orbitals within each band.
Something interesting to take note of is that when current flows in a conductor, it creates a magnetic field. The strength of the magnetic field is dependant on the conductor used and the amount of current, and the amount of unpaired electrons might have an effect on it (I haven’t done much research on this). The magnetic field can induce negative voltage in the conductor, which is called back emf (electromotive force). The result is that the conductor will have a tendency to resist any change in the current. The whole concept is quite complicated, and I recommend checking out Draedon’s TED Talk. I believe he talks about it a bit.
Thanks for your interest,
Colin
Nice work Colin, I liked how you were really clear and detailed throughout your presentation. Personally, I thought that you could have added a few more slides because you had a lot of graphs because we get more info but it was also a little distracting after you finished talking about the graph so it would be nice if you had even just a picture or a few points on a slide. All in all great job on your presentation. I was wondering about what resistivity is and how it’s different than resistance (if it is) and why it was used in one of the graphs instead of resistance.
Hi Ronan,
Thanks for the constructive criticism, I will keep that in mind. Resistivity is similar to resistance, except it takes into account the length of the material and some other factors. If you think about it, resistance is not a property of a material. There is no such thing as resistance of a material. Resistivity is a property of a material. It is the resistance of the material per unit of length and cross-sectional area (make sure you take into account temperature!). Usually it is measured in ohm-meters. It is a bit complicated to calculate. Actually I should have made my question “How does the resistivity of different materials change with temperature?” but I didn’t really know the difference between resistance ad resistivity at that time when I thought of the question.
Thanks,
Colin