Predictions for physics practical tom!!

[Twinkle Charms]

Semi conductor diode is a device that will conduct current in one direction only

LED Light Emitting Diode, which glows when current passes through it

[scorpion9500]

so the graph is..
wat is on x-axis nad wat is on y-axis??

[coco pops]

any particular way of connecting the diodes?

[Twinkle Charms]

@scorpian dont worry theyll tell you what to take on y and x axes.

@coco pops  yes ofcourse, u have to connect positive terminal of the diode to the positive of battery cz if u do it vice versa....the diode will not work

[ifraha18]

i hve never used a power supply before..how do we vary voltages o power supply?

and i dont understand..wht the diode is for

[Twinkle Charms]

i hve never used a power supply before..how do we vary voltages o power supply?

and i dont understand..wht the diode is for

huuh?? didnt u practise any of the experiments in lab??

anyways you can vary the voltage by variable resistor, and the experiment is about diode, so its for that lol

[Twinkle Charms]

You ripped this off xtremepapers' forums P:

By the way, this is for paper 33.

yeah

[XaM!!]

@diablo any idea of 34 varient?

[Alayna]

hey..any idea whats coming in varient 31? im clueless

[Twinkle Charms]

hey..any idea whats coming in varient 31? im clueless

uh nop

[62Peace]

how do you know how many significant figures to quote?

[Twinkle Charms]

how do you know how many significant figures to quote?

whatevr s.f you are usuing intially be consistent with it till the last of that question for all the values, for example if you took 3 s.f for your first reading, then for all the other values write them correct to 3 s.f.   

[62Peace]

So basically the initial number of significant figures that I should use is my own choice but what matters is that i should keep them the same for the values calculated from the raw values?
For example I am recording the diameter of a ball using a micrometer or a v.calliper, then using 3 significant figures in both cases would be right?
What about thermometric readings? Will, say, 31.2 degree C be okay?

[Diablo]

Paper 31 is most likely to have 1 circuit related question and another mechanical question (oscillations, pendulum, etc).

I heard that there's going to be an oscillation question(mechanical question) and something regarding a magnet and thread in paper 34.

This information is merely based on what the vast majority are saying.

Good luck everyone....

[Twinkle Charms]

okay for the second question, errors and improvements :

Errors
1. small air bubbles are formed on the marble/spheres/(any balls being used) which hindered the motion of the ball
2. two sets of reading not enough to draw a valid conclusion
3. human error in timing
4. marble may have not reached terminal velocity


Improvements
1. release the ball/marble just a few mm above the oil surface
2. take more readings and plot a graph
3. use light gate to trigger stopwatch/high speed camera with known time intervals/use video camera with slow motion replay
4. ensure the terminal velocity by increasing the release height/using long tube/measure velocity at two intervals to check terminal velocity reached.



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