Why we cannot measure very high or very low resistance?
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Hi dear,
We use weight stone bridge for measuring resistance., but.....
Low Resistance: Wheatstone Bridge can not be used to measure low resistance because then the wire resistance and lead resistance come into the picture and affect the result. Suppose a low resistance is 1 ohm and lead resistance is 0.02 ohm and then it’s already 2% error. And these errors will only increase as you know errors get added in every step of calculation.
High Resistance: In wheatstone bridge, one balance the bridge by nullifying the deflection of the galvanometer. Now if you use high resistance, the current will be very low. Hence the galvanometer needs to be very sensitive to sense the low current; otherwise you will get zero reading even if there is current flowing through the meter and the bridge is unbalanced.
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Cheers
BRAINLIEST✌✌
We use weight stone bridge for measuring resistance., but.....
Low Resistance: Wheatstone Bridge can not be used to measure low resistance because then the wire resistance and lead resistance come into the picture and affect the result. Suppose a low resistance is 1 ohm and lead resistance is 0.02 ohm and then it’s already 2% error. And these errors will only increase as you know errors get added in every step of calculation.
High Resistance: In wheatstone bridge, one balance the bridge by nullifying the deflection of the galvanometer. Now if you use high resistance, the current will be very low. Hence the galvanometer needs to be very sensitive to sense the low current; otherwise you will get zero reading even if there is current flowing through the meter and the bridge is unbalanced.
Keep learning
Cheers
BRAINLIEST✌✌
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