Qualification > Sciences
P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
sabrina:
systematic errors r errors which r affected to same extent. it is the instruments fault. it can be fully removed if the cause is known. whenever systematic errors occurs always check the zero error. in graphs we can find out if the error is systematic by seeing if the line passes through the origin or not.
random errors r errors which r affected to different extend. its experimenters fault. it can be minimize by repeating the experiment several times n finding out the average. in graphs we can find out if the error is random by scattering of lines
hope its clear :)
halosh92:
--- Quote from: cashem'up on June 08, 2010, 12:14:58 pm ---hey guys one question i had.... if i kept a filament in constant temperature lets say in Ice then would its IV graph be a straight line through origin
--- End quote ---
how is it possible to that...the filament itself will heat up because the current passing through it will heat it up i guess.
but maybe if u keep adding ice....and keep it constnt temp. then yea it will i guess. according to ohms law ???
could someone answer my question plz :(
Chingoo:
By definition, systematic error is an error having constant direction and magnitude in all readings. Consider a situation where your stopwatch starts from 0:00:10 s only; all your readings will have an additive 0.1 s. It will not vary with situations. Such an error can be eliminated by taking a difference/gradient. Consider you had to measure the time interval for a ball to fall between a distance XY; the first reading (when it crossed X) was 0:02:00 s, and the second reading (when it crossed Y) was 0:04:10 s. The time interval is the difference of the two:
4.10 - 2.00 = 2.10.
Even if the systematic error was absent, the DIFFERENCE would be the same i.e. 4.00 - 1.90 = 2.10 s.
Systematic errors do not affect the precision of a measurement, but they affect the accuracy.
By definition, random error is an error having a varying direction and magnitude in all readings. This is quite simple, for instance, given the same example as above--it is not possible for us to start the stopwatch at the exact moment the ball crosses X, as there is a human reaction error of 0.1 to 0.4 seconds. This error cannot be eliminated with a gradient or difference, because it is not constant. A random error does affect the precision of a measurement, but not its accuracy.
Chingoo:
--- Quote from: cashem'up on June 08, 2010, 12:14:58 pm ---hey guys one question i had.... if i kept a filament in constant temperature lets say in Ice then would its IV graph be a straight line through origin
--- End quote ---
Like halosh said, if you keep the temperature of the filament constant by adding ice frequently, it will be a straight line through origin. Follow the rules of the Ohm's Law:
The current through a resistor is directly proportional to the potential difference across it if external conditions such as temperature and pressure remain constant.
Simple ;)
sabrina:
--- Quote from: Chingoo on June 08, 2010, 12:22:50 pm ---By definition, systematic error is an error having constant direction and magnitude in all readings. Consider a situation where your stopwatch starts from 0:00:10 s only; all your readings will have an additive 0.01 s. It will not vary with situations. Such an error can be eliminated by taking a difference/gradient. Consider you had to measure the time interval for a ball to fall between a distance XY; the first reading (when it crossed X) was 0:02:00 s, and the second reading (when it crossed Y) was 0:04:10 s. The time interval is the difference of the two:
4.10 - 2.00 = 2.10.
Even if the systematic error was absent, the DIFFERENCE would be the same i.e. 4.00 - 2.10 = 2.10 s.
Systematic errors do not affect the precision of a measurement, but they affect the accuracy.
By definition, random error is an error having a varying direction and magnitude in all readings. This is quite simple, for instance, given the same example as above--it is not possible for us to start the stopwatch at the exact moment the ball crosses X, as there is a human reaction error of 0.1 to 0.4 seconds. This error cannot be eliminated with a gradient or difference, because it is not constant. A random error does affect the precision of a measurement, but not its accuracy.
--- End quote ---
::) ::) wow good explanation.
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