Qualification > Sciences

Edexcel PHYSICS Doubts

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Nobody:

--- Quote from: studz on June 05, 2011, 10:50:23 pm ---even i dint get where did they bring 0.5 from

anyway guys can you list out the uncertainties of measurement of the following apparatus?
1. metre rule
2. voltmeter (not digital)
3. ammeter (not digital)
4. voltmeter (digital)
5. ammeter (digital)
6. Digital stopwatch
by the way, is human error an uncertainty too? Is human error 0.01s?
If it is, then please consider this case:
when a ball is allowed to free fall for 2s, the distance is recorded. (different sizes of ball are used) the distance has an uncertainty, however the uncertainty is human error (0.01s+0.01s) or uncertainty of the metre rule (0.5mm+0.5mm)?

thanks  :)

--- End quote ---


1. metre rule > 1 millimeter
2. voltmeter (not digital) >
it depends on the instrument that you use.
here it will be 10V
here it will be 2V
just measure the smallest value in the instrument.
that's the uncertainty ;)

3. ammeter (not digital) >
again depends..
here it will be 2 A


4. voltmeter (digital) > if you read "5.034" uncertainty is "0.001 A" if you read "50.34" uncertainty is "0.01 A" ans so on
5. ammeter (digital) > same a above. ^^
6. Digital stopwatch > 0.1 second

Dangerous99:

--- Quote from: Nobody on June 05, 2011, 11:28:33 pm ---yes!
yes! It will be 0.01.
boy, you're smart!  :D ;)

significant figures & decimal place are two different things ;)

--- End quote ---

okai u know what? im feeling really dumb rite now cos according to what u just said the uncertainty is 0.01 not 0.5 like the mark scheme says.

Assi1993:
Uncertainties in some instruments:

    * Stopwatch: 0.2 secs
    * Metre rule: 1mm
    * Vernier caliper: 0.1mm
    * Micrometer: 0.01mm
0.1 for the voltmeter

Assi1993:

--- Quote from: Dangerous99 on June 05, 2011, 11:33:17 pm ---okai u know what? im feeling really dumb rite now cos according to what u just said the uncertainty is 0.01 not 0.5 like the mark scheme says.

--- End quote ---

which question,paper?? i want to check what it is

Romeesa-Chan:
Please help me with the last question part d!   :-\

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