What is the difference between absolute and secondary instruments?
Answer:
The difference between absolute and secondary instruments are tabulated below.
Absolute instruments |
Secondary instruments |
The values of the quantity to be calculated in terms of physical constants and their deflection are given by Absolute Instruments. |
Secondary instruments are tools whose production is calculated to give the quantity’s value. |
It is not necessary to calibrate them and there is no need to compare them with the other standard instruments. |
The quantity to be evaluated should be measured by the amount of the deflection of these devices. |
Absolute instruments are being used as standardization methods in laboratories. |
It is important to calibrate these tools against an absolute instrument. Secondary instruments are utilized in day to day life. |
Examples – Absolute electrometer, tangent Galvanometer etc |
Examples – Voltmeter, ammeter etc |