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# Edexcel Physics Unit 3 9th May Watch

• View Poll Results: Do you think question on Multimeter will come?
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1. (Original post by Relaxedexams)
When calculating the max you divide largest by smallest. (therefore one +, the other -)

When calculating min you divide smallest by largest (one -, the other +)
so first if the first is +ve then its max.
and if the first is -ve then its min.?
2. (Original post by Meera.S.)
so first if the first is +ve then its max.
and if the first is -ve then its min.?
Yep

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3. Please could you describe the general idea of internal resistance?
4. Correct me if I'm wrong but isn't there another Unit 2 Practical which is important about polarisation and how it is used to detect sugar concentrations?
5. Does anyone have some notes for this paper?
Thnx

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6. (Original post by leafy9)
Does anyone have some notes for this paper?
Thnx

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hope these help
Attached Images
7. Paper 7 Notes - Final.pdf (547.1 KB, 782 views)
8. Which practicals are you guys expecting? I'm thinking maybe, measuring Plank's constant or young modulus.
Correct me if I'm wrong but isn't there another Unit 2 Practical which is important about polarisation and how it is used to detect sugar concentrations?
Are you sure if its in the spec? I don't think there is such a thing in our spec, but I can be mistaken...
10. (Original post by Relaxedexams)
Are you sure if its in the spec? I don't think there is such a thing in our spec, but I can be mistaken...
when you investigate the polarisation of the light using different sugar solutions..
11. (Original post by nat_nat)
how to find the range for the full-scaled ammeter and voltmeter?

what do you mean by 'full-scaled'
12. (Original post by Relaxedexams)
Which practicals are you guys expecting? I'm thinking maybe, measuring Plank's constant or young modulus.
plank's constant most likely
13. (Original post by l-g)
Please could you describe the general idea of internal resistance?

resistance in the battery/cell
14. (Original post by nat_nat)
Each ammeter and voltmeter or even multimeter have a full scale range.

In the experiments about internal resistance, the question asked about choice of measuring instrument. On choosing ammeter and voltmeter, the mark schemes require us to "comment on adequate range"

What does the marker expect us to write?

something like 'voltmeter most appropriate gives reading to 1v'
15. why aren't the past papers up on the edexcel website anymore?
16. (Original post by Relaxedexams)
Which practicals are you guys expecting? I'm thinking maybe, measuring Plank's constant or young modulus.

My guesses are standing waves, measuring refractive index, Young Modulus, resistivity or Planck's constant.
17. (Original post by ZTH)
My guesses are standing waves, measuring refractive index, Young Modulus, resistivity or Planck's constant.

LOL! ALL of them
18. (Original post by Meera.S.)
set circuit ;; the cell/battery. ammeter connected in series. volt meter parallel to variable resistor.by changing the value of R, measure current(I) and pd(v)plot a graph pd against I (the graph would be linear) the y-intercept is the emf.the equations is "E"= Ir - IR(which is V, since V=IR) r= internal resistance.y=mx+c --> V=-r I + "E" i.e; m=-r gradient is the internal resistance.
Thanx soo much
19. hey guys lets jus have poll for experiments...pls
20. What do you think will come tomorrow?
21. (Original post by nat_nat)
Thanks

Could someone please deacribe experiment of measuring Planck constant?
I think the basic thing you have to know is K.E=hf-hf0 [KE y-axis, f x-axis, x-intercept is f0 and gradient is Planck constant]

The experiment can vary but the main thing is drawing the graph of KE against f and using that to get Planck constant which is the gradient.

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