Edexcel Physics Unit 3 9th May

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.?

Does anyone have some notes for this paper?
Thnx


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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...

how to find the range for the full-scaled ammeter and voltmeter?

Which practicals are you guys expecting? I'm thinking maybe, measuring Plank's constant or young modulus.

Please could you describe the general idea of internal resistance?

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?

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.

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.

Thanks

Could someone please deacribe experiment of measuring Planck constant?