Measuring the Resistivity of a Wire - PRACTICAL - A Level Physics

[@sarahsohrab7624]

a level physics online is literally the most helpful resource you can find for your exam revision.THANKS A LOT.

[@roba5733]

What a hero. Really saved me with this one..

[@retailerz1347]

thanks. very informative. much more helpful than the information in the book about resistivity.

[@PhysicsOnline]

Thanks

[@apurbomahamudul6846]

i absolutely loved your videos. Very clear explanation and Love the drawings

[@random-cy8yx]

awesome video as usual!! was wondering if there will be similar videos on practicals for A2?

[@PhysicsOnline]

There will be soon....

[@fluffboyjr12]

REEEEsistivity

[@Anonymousdajoker]

You're like a god you know that right i appreciate your channel a whole lot man

[@PhysicsOnline]

Krishan Patel Thanks!

[@user-yj2xo5oo1q]

Thankyou so much you saved my life

[@PhysicsOnline]

Not a problem!

[@abiramin3012]

Brilliant!

[@lollystimler325]

Do you have the Summery sheet for this practical and onward, like for the ones previous? they are very helpful.

[@xav7330]

is there a playlist with all of your videos on practicals or is it only this 8?

[@jimmij9415]

Awesome!

[@fusion_]

so in the experiment you change v to try and keep i the same due to the increasing length?

[@rainrelaxation861]

i think I got around 40 on the first first paper, 45 on the second paper and I think I'll get 100 on the paper 3. Do you think I have a chance of getting an A?

[@Zaki_____]

Hi dont mind me asking what did you get?

[@innocentememe5469]

how are we meant to vary the lenght of the wire ?

[@nataliecavanagh8671]

frenzy drinzy I put the crocodile clips at different points along the wire, it seems to work from my experience

[@lizzyphilips492]

Hey thanks for the great video! But when I tried using your circuit setup it short circuited. What should I do?

[@PhysicsOnline]

Lizzy Philips You could add a resistor in series with the wire you're testing.

[@shyan_khan]

@@PhysicsOnline what does adding a resistor do

[@lucahorbacki7745]

where did you get your pen from

[@PhysicsOnline]

Ebay

[@lucahorbacki7745]

what brand is the pen

[@charlieroberts4293]

Luca Horbacki ebay

[@BliiiiBlaaaaBluuuub]

what if we started from 1m and decreased it? Also, do we have to change the voltage every time we change the length? What if we took values for 1-6V each for every length from 0.3 to 1m? a bit confused

[@PhysicsOnline]

Starting from 1m and decreasing the length is absolutely fine - there is always more than one way to get the same result. Keeping the current the same is a control variable so any heating effect will be the same each time, and this can be controlled by altering the p.d.

[@BliiiiBlaaaaBluuuub]

what if we started from 1m and went down to 0.3m, however started with 1V instead of 8V. In other words, we have taken the highest length with the lowest voltage possible and the smallest length with the highest voltage. Will that affect the practical negatively?

[@PhysicsOnline]

BliiiiBlaaaaBluuuub You may have a higher current with the shorter lengths and therefore more of a heating effect which would change the resistivity of the material at these higher temperatures.

[@swordycow]

could you use an ohm meter?

[@PhysicsOnline]

George Shaw That would also work, but this is a method that is normally recommended as using an ohmmeter is a bit too easy!

[@aqibhossain6033]

can anyone say what would be the graph for resistance vs area? provided length of wire is constant

[@PhysicsOnline]

Area and resistance are inversely proportional. Double the area, halve the resistance

[@tgdhsuk3589]

is this for ocr 2015 specification

[@PhysicsOnline]

Yes it is

[@MagicSecretsandMysteries]

Can you use it for Edexcel?

[@sheeryawan3806]

why do we have to adjust the voltage?

[@ryankyle321]

I know this is 2 years late 😂 but I think it’s to keep the current around a certain value

[@ahvi-tohoku]

best