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Hardik Batra
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why the meter bridge experiment not useful for the measurement of small resistance?
Hardik Batra said:why the meter bridge experiment
not useful for the measurement of small resistance?
Hardik Batra said:Ok. I mean wheat stone bridge.jtbell said:I assume you mean what people (in the US at least) usually call a "Wheatstone bridge", rather than the kind of meter bridge that is used in an audio recording studio:
http://www.sweetwater.com/c434--Mixer_Meter_Bridges
Before reading your post, I had never seen a Wheatstone bridge referred to as a "meter bridge", but a Google search revealed that in some places it does indeed have that name. I've learned something new today!
I don't know the limit of small resistance.
jtbell said:I assume you mean what people (in the US at least) usually call a "Wheatstone bridge", rather than the kind of meter bridge that is used in an audio recording studio:
http://www.sweetwater.com/c434--Mixer_Meter_Bridges
Before reading your post, I had never seen a Wheatstone bridge referred to as a "meter bridge", but a Google search revealed that in some places it does indeed have that name. I've learned something new today!
Small compared to what?
jtbell said:The one that we use in our introductory lab apparatus is in fact one meter (metre) long, mounted on top of a meter stick! (which is in turn mounted along with electrical terminals on top of a board)
Hardik Batra said:In meter bridge experiment,
I have resistor values R1 = 0.5 ohm, R2 = unknown(that we want to find. consider R2 has also very small value.)
R3 and R4 decided by moving jokey key on meter wire.
Some one says me you can't use this method because the resistance value is too small.
So this is true or false.
True then which method is used?
A meter bridge experiment is a physics experiment that is used to measure the unknown resistance of a conductor by balancing the ratio of known resistances on a meter bridge. It is a simple and accurate method for finding the resistance of a conductor.
The materials needed for a meter bridge experiment include a meter bridge, a galvanometer, a battery, a rheostat, a jockey, and a set of known resistances. Other materials may be needed depending on the specific experiment being conducted.
A meter bridge works by balancing the ratio of known resistances on one side of the bridge with the unknown resistance on the other side. This is done by adjusting the length of the known resistance wire and the position of the jockey on the unknown resistance wire until the galvanometer shows no deflection, indicating a balanced bridge.
The sources of error in a meter bridge experiment can include inaccuracies in the measurement of the known resistances, variations in the temperature of the wires, and human error in reading the galvanometer. To minimize these errors, it is important to use high-quality materials and to take multiple measurements and average the results.
The advantages of using a meter bridge experiment include its simplicity and accuracy in measuring resistance. It also allows for the measurement of very small resistances, making it useful for testing conductors with low resistance values. Additionally, the materials needed for a meter bridge experiment are relatively inexpensive and easily accessible.