AS PHY PRACTICAL 33

[Hamza1996]

what is absolute uncertainty? Is it the uncertainty not multiplied by 100? like a reading on a meter rule is 5 cm so absolute uncertainty is 0.1/5 na? and % uncertainty is 0.1/5 *100 ? Am i correct?

yes u r rite!

 

[kalpaveen]

can someone please explain to me how to connect a variable resistor.....

 

[Yousaf Jalal]

can any1 tell me how to use variable resistor??

slide left to right to get either zero resistance or 100 percent resistance

 

[RWTH]

Variable resistors are actually more easy to use. There`s a movable rheostat on the resistor. You start by keeping the rheostat on the right most part and note the Ammeter/Voltmeter reading. Then you move the rheostat to equally by certain distances, and noting the various V & I values. That is ofcourse after setting up the apparatus

 

[falcon678]

no need to fret..its rather simple!

 

[skylexgale]

I hate electricity practicals blah. I'm really hoping somehow first question doesn't even have a graph.
Has it ever happened that a electricity part didn't have a graph?

 

[Nurain]

Exactly ,confirmed. Basically the height of the slope is to be changed.

Not sure about that! As far as I know, you dont have to change the height. Just the distance from which you're dropping the ball!

 

[falcon678]

I hate electricity practicals blah. I'm really hoping somehow first question doesn't even have a graph.
Has it ever happened that a electricity part didn't have a graph?

but dude this time itz cnfrmed...

 

[Shaur Humayun]

thank u...

alrite guys...finaly here it is..!

two questions....one electcial other mechanical... electricity one will consist of -Variable Resistor, switch, battery, a sample wire, connecting wires, an ammeter and voltmeter...u willhave to measure the V & I after setting the apparatus after changing resistance of the rheostat on the variable and make a graph using the values....
while the second one has a clamp stand, a marble, stopwatch...u need to slide down a ball from a certain height, note the time.....

simple eh?

 

[falcon678]

no problemo...

 

[Joker101]

ok guys thanks for the info but here is my question

they include both a wire and a rheostat. why is this so? wouldnt the circuit look weird? you have two ways to vary resistance.

 

[RWTH]

Not sure about that! As far as I know, you dont have to change the height. Just the distance from which you're dropping the ball!

Could be the case. Atleast the instruments are confirmed

 

[skylexgale]

yes u r rite!

isn't the least count of a meter rule 0.1 mm, which is 0.01 cm and thus uncertainty = 0.005/calculated-value ?

 

[MustafaMotani]

do you have to find the value of the resistance of that wire.. ?

 

[MISHEAL]

can we write
'difficult to throw the ball and start the timer simultaneously'
and 'use assisstance'
in the limitation and improvement section??

 

[falcon678]

do you have to find the value of the resistance of that wire.. ?

itz neva tht complicated dude....

 

[hela]

how do you calaculate the pourcentage incertaimty
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w07_qp_31.pdf

 

[MustafaMotani]

itz neva tht complicated dude....

lol it wont be complicated ... we just have to do what the instructions says and in the end gradient or something will give the resistance of the wires..

 

[hela]

Okay guys.
Physics 33 Tomorrow will have an electricity experiment. And another simple one.
The electricity one will consist of -Variable Resistor, switch, battery, a sample wire, connecting wires, an ammeter and voltmeter. You`d have to measure the V & I after setting the apparatus after changing placing of the rheostat on the variable and most probably make a graph.
The second one has a clamp stand, a banta ( I dunno whats that called in english ). stopwatch. And you need to slide down a ball from a certain height, note the time.
Note : These are not the confirm experiments. However these instruments are confirmed, and probably the experiments will be somewhat the same as above. Don`t ask about the validity, for sure these will be there tomorrow.

Anything on Physics 31 please?

 

[falcon678]

lol it wont be complicated ... we just have to do what the instructions says and in the end gradient or something will give the resistance of the wires..

i cant say anything bout tht thou?