Resistivity of the Material of a Wire - A Level Physics Core Practical
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- เผยแพร่เมื่อ 28 ส.ค. 2024
- One of the core practicals in A Level Physics. This uses an Ohmmeter to measure the resistance of a wire directly.
By varying the length of the wire, and taking sets of data across several thicknesses we can get to a value for the resistivity of the material in question.
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Thank you for the idea, Mr. Betts. I look forward to using this investigation in the upcoming academic year.
-MrH
MrH physics thanks very much.
I hope you'll check out the other practicals in this playlist! 🦍
what are safety precautions within this practical
Very little as it's such a low current. Some people talk about the ends of the wire being sharp, but that's a tiny risk not worth mentioning really! If you do use a circuit then use a low voltage so that there isn't a chance of wire getting too hot/causing burns. This will also make your readings more accurate.
Thank you for this, very helpful.
my pleasure glad to be useful!
Hi Kit, I am a science technician supporting A level physics. I find your videos really insightful. Have you used an excel formula to calculate the radius and area? I cannot seem to match your figures in trying to work it out, so then I can transfer onto my data to work out.
Ah thanks so much, very glad to know that they are still helping people out! Yeah, perhaps you are having trouble with the "pi" function? It's weird that "=pi" returns pi, but you can't just write pi into a function. I either just fudge it and go for 3.14 in the fomula, if I'm feeling fancy I'll stick "=pi" in a cell and reference that in the function. Either way, you should be ok with Area being "=3.14*(d/2)^2" Hopefully that works!
@@KitBetts-Masters The only part I am struggling with now is how did you get r^2 which is 1.44E-08 on your spreadsheet. I am trying to self teach here as it has been a very long time! It is for making technician notes for the future. Thank you again. It is much appreciated.
thank you,
Thanks a lot!
can you post a video on how to connect an AF oscillator(signal generator) and a CRO to a single stage amplifier and h parameter experimental setup on a bread board
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why would you use the multimeter instead of the ohmeter? it because there would be less resistance
What happens if we did multiple trials? Can we still go with that and get an average of the resistances or just the best one trial would do
And wouldn’t only doing one trial / experiment cause errors possibly
So, the point is that in this case multiple trials could cause an error. The wire could heat up, so with electricity practicals it's better to just do one trial with more data points. In reality this probably doesn't make a massive difference in this case, but is an important consideration.
What voltage and current did u put through the wire ??
Seth Freeman Payne I didn't, as I just used the multimeter on Ohmmeter setting. It measures the resistance directly. It's always best to keep current as low as possible though to avoid heating changing the resistance of the wire. I guess the multimeter does put a small voltage across the wire and measure the current to calculate the resistance, but it'd be very small.
Thanks
Hi thanks so much for the helpful video! I'm just wondering why don't you need to connect a power supply to measure the wire's resistance? Would it be different if you measured the current and voltage separately and used the values obtained to find the wire's resistance instead?
Lizzy Philips hiya, the multimeter is measuring resistance directly. If you like it puts a small potential difference across the wire and measures the current, hence determining R.
Lizzy Philips if you used a cell or power pack you may get some heating effect which would change resistance, but in my experience it tends to be quite consistent except at very short lengths. glad to help!
Thanks for replying so quickly!
In 2 days maybe...please would you?? i have an exam i have to connect the whole circuit by myself... and the handling would count
+Rimsha Farooq th-cam.com/video/ply0RA5HDLA/w-d-xo.html this is my video on using an oscilloscope. Sorry, nothing on adding an amp. My guess is it goes in between signal gen and scope.
why is my multi meter showing the same resistance for my wire no matter where i put it. Also, the numbers on my multi meter are going everywhere, from 150 to 0.4, before they reach the same number.
Need more information, what metal are you using? Fluctuations might be due to dodgy connections somewhere. Are you using it as an ohmmeter or a voltmeter?
@@KitBetts-Masters i am using an aluminum wire and an ohmmeter on the lowest setting of 200. Also, thank you for replying very quickly!
@@tim9208 try the other things, check connections, multimeter placement, check it's not on a.c. mode.
@@KitBetts-Masters it does not seem to be working
Sorry buddy, not sure without seeing the circuit. Try the old fashioned swapping out each component and hopefully you'll find the issue!
excuse me but could you please do the practical on how to measure percentage loss in kinetic energy using a ball. thank you.
Amos Morais hiya, that sounds interesting. I don't know exactly the method you want to use. what I would do it probably use tracker software and video a ball bouncing, and compare the GPE with KE for each bounce, does that sound about right?
this is my tracker explanation:
th-cam.com/video/HeDSjmWw_Fs/w-d-xo.html
yes that's the one
which spec do you do?
edexcel
why is it so confusinggg😭😭😭😭😭😭
Have you tried any of the other videos available?
th-cam.com/video/gtpPsyQ7dD4/w-d-xo.html
th-cam.com/video/XYOgL_vr3eE/w-d-xo.html
th-cam.com/video/lOpp6q55pv8/w-d-xo.html
Something should help it sink in!
Otherwise, you've just got to get the apparatus and have a go until you do get it!
Kind regards,
K
your equation is WRONG
Errr... Like where?