Measuring Internal Resistance - PRACTICAL - A Level Physics

[@AK476056]

Mate, you're a life saver!

[@PhysicsOnline]

Thanks

[@mubafaw]

Literally made my day and was able to use this to analyse to different sets of cells and the results were astonishing! Thank you!! 😀

[@jackvanbenthuysen]

Wow thanks! I am taking an electricity and optics lab but because of covid it is all online and you are doing a better job at explaining this than my professor and TAs

[@hackercop]

You are a hero, have subscribed!

[@30raccoon]

Thank you for the great explanation!

[@brightspark1119]

Hi, I was wondering what some of the key risks to consider are

[@TehRossyy]

Thank you for this video however what is the point in the switch?

[@yousefsayed5070]

I don't know but if we want to measure the internal resistance of voltameter we should put the voltameter in series with the circuit, I know it have too much resistance, so we can measure it?

[@matteo5399]

Why doesn’t putting the voltmeter across the terminals give us electromotive force? Isn’t it measuring the pd of the terminal and the internal resistance?

[@PhysicsOnline]

It will give a value very close to the emf, but the voltmeter could draw a very small current so your terminal pd measured may be lower.

[@matteo5399]

@@PhysicsOnline Would the value on the voltmere still equal the external voltage that goes to the rest of the circuit?

[@zndh]

@@matteo5399 no

[@mahinchowdhury6833]

It was an amazing explanation. Thank you 😄

[@seanki98]

Thanks for the video sir! I was just wondering- wouldn't you need a fixed resistor to be in the circuit as well in order to have a better control of the current- for safety reasons?

[@remak6342]

It'll be like a 1A current at most, so I don't think it'll be that dangerous.

[@sajaniskumar7672]

Sir,Will the resistance of the voltmeter and ammeter affect the calculation??

[@PhysicsOnline]

No

[@jordangatt2001]

This was so helpful. You made it interesting. Thanks! :)

[@PhysicsOnline]

Jordan Gatt All Physics is interesting!

[@yeetspageet5679]

+A Level Physics Online circuits and electricity is in no way interesting to me but your short, to the point videos are engaging and make everything intuitive for something you can spend 10x the time on and not get :)

[@yeetspageet5679]

+A Level Physics Online also I'd like to ask a question, have you covered the practicals on the gas laws? Some of the videos in the playlist are private so I wondered if those are them.

[@michalmasiak713]

Nice, but... What is the point of taking a few measurements? I see two: a) ascertain that internal resistance is linear in the range of drawn currents (because you obtain a straight line with certain slope) (and this does not need to be the case), and b) accuracy of the measurements. But technically, you could get this "internal resistance" using just a single measurement and dividing U/I. So, my question is: do you really get the true EMF and internal resistance using this method?

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