Higher Physics Thermistors

whats up

I am doing a higher physics assignment and I really need help on my underlying physics. I can't take notes written in my own words into the assignment write up, it has to be direct from a source.

here are 2 links to an assignment (same experiment as me) and the marks+commentary it got to give u an idea. copypaste.
https://www.understandingstandards.org.uk/Higher_images/physics/PhysicsHigherAssignment2018Candidate6Evidence.pdf
https://www.understandingstandards.org.uk/Higher_images/physics/PhysicsHigherAssignment2018Commentary6.pdf
could someone please give me a good link(source) that can help me with my underlying physics?
if u see the commentary u can have an idea of what i need to write for my underlying physics. please help.

OP

someone??

Original post by dude101010

whats up

I am doing a higher physics assignment and I really need help on my underlying physics. I can't take notes written in my own words into the assignment write up, it has to be direct from a source.

here are 2 links to an assignment (same experiment as me) and the marks+commentary it got to give u an idea. copypaste.
https://www.understandingstandards.org.uk/Higher_images/physics/PhysicsHigherAssignment2018Candidate6Evidence.pdf
https://www.understandingstandards.org.uk/Higher_images/physics/PhysicsHigherAssignment2018Commentary6.pdf
could someone please give me a good link(source) that can help me with my underlying physics?
if u see the commentary u can have an idea of what i need to write for my underlying physics. please help.

The candidate went on to write about the theory of operation of LDR and was a bit wooly about what the thermistor is...
e.g. better to say something like 'thermistors can be used as the temperature sensor in a circuit designed to regulate temperature'
than something like 'thermistors regulate temperature'
There are 2 main types of thermistor - probably better to mention this and then deduce from the results what sort it is that you are using.

explanation of the theory of operation in terms of physics - the candiate has realised that the valance and conduction bands of semiconductors are relevant. IMO you want to be typing queries like
"thermistor explanation in terms of valence electrons" into google
top result https://www.physics-and-radio-electronics.com/electronic-devices-and-circuits/passive-components/resistors/thermistor.html

probably worth using words like 'doping' (and phrases like 'carefully controlled quantities') when talking about impurities in semiconductors - electronic components don't just happen by accident

I thought copying in a nice simple diagram of the band gap might help so I typed
"thermistor band gap diagram" into google search and the top result was
http://www.cas.miamioh.edu/~marcumsd/p293/lab7/lab7.htm
the band gap diagram wasn't all that nice TBH but there's a good hint about what sort of temperature resistance graph you should be plotting on that page.
note that's an example of academic website

Obviously there's an industry producing thermistors and the companies making them want people to buy their products so manufacturers 'application notes' can be a useful source of information - IMO they're usually really well written and concise... this could help you explain how thermistors are used and there's also a chapter about measuring thermistors at the bottom of this one which could be useful.
https://www.vishay.com/docs/29053/ntcappnote.pdf

it doesn't IMO hurt to briefly restate some quite basic principles that are relevant i.e. electric current is the flow of charge carrying particles but don't waffle too much or go off an a tangent about LDRs.

getting your google search terms right is important and it's quite a labour intensive process finding the information you want - IMO allow hours for this

Higher Physics Thermistors

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