- #1
LoveBoy
- 44
- 1
Homework Statement
Homework Equations
How to find error in resistance ?
The Attempt at a Solution
I found out the resistance without error.
But What is the way to figure out an error of an instrument ?
As per your given hint,ehild said:Write the formula you use to calculate the unknown resistance. You read the position x of the slide contact with error of dx= 0.1 cm (or 0.05 cm). R is a function of x: R=f(x) and its error is dR=f ' (x) dx.
Some people consider the reading error as the smallest scale, other consider half of it as the reading error.
If you do not want to differentiate, calculate the resistance with the reading changed by ± the reading error. If it is ±1 mm, calculate the resistances with x=36.1cm and 35.9 cm, and give the deviation from the resistance calculated with x=36 cm.
What does that mean ?ehild said:give the deviation from the resistance calculated with x=36 cm.
You got 9 ohm with x=36. So the reading error makes the resistance value deviate about 0.3-04 ohm from the real one. To which answers is it closest?LoveBoy said:As per your given hint,
i calculated resistance.
When x=36.1 cm , R=9.03 ohm
When x=35.9 cm, R=8.96 ohmWhat does that mean ?
If l is the length read on the meter, it is right. Take the derivative with respect to l at l=36 cm and multiplied it with Δl=0.1.LoveBoy said:
Right ?
A meter bridge is a device used to measure resistance in a circuit. It consists of a long wire, a jockey, and a resistance wire connected in series.
A meter bridge works by balancing a known resistance with an unknown resistance using a sliding jockey. The unknown resistance can be calculated using the known resistance and the distance of the jockey from the known resistance wire.
The purpose of using a meter bridge to find error in resistance is to accurately measure the resistance of a circuit element and identify any discrepancies or errors in the measurement. This can help improve the overall accuracy and reliability of the circuit.
Some sources of error in using a meter bridge to measure resistance include inaccurate placement of the jockey, resistance in the connecting wires, temperature changes, and imperfections in the resistance wire.
To minimize errors in resistance measurement when using a meter bridge, it is important to ensure precise placement of the jockey, use high-quality connecting wires with low resistance, maintain a consistent temperature, and use a high-quality resistance wire.