30 points
>
>
Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Physics (PH)
Electricity
why the marking on the scale of direct current apparatus like ammeter, voltmeter, galvanometer etc are equidistant on the other hand for alternating current it is not??
2 Answer(s)
Answer Now
- 0 Likes
- 2 Comments
- 0 Shares
-
![comment-profile-img]()
>
-
![comment-profile-img]()
>
Aishwarya pandey Best Answer
AC ammeter is constructed on the basis of heating effect of electric current. Since the heat produce varies as the square of current (and not directly with current) the division marked on are not equally spaced. While DC ammeters are mostly PMMC(permanent magnet moving coil) ammeters which work on the principle of magnetic force applied on a moving current carrying wire.When current carrying conductor placed in a magnetic field, a mechanical force acts on the conductor, if it is attached to a moving system, with the coil movement, the pointer moves over the scale.
Do You Want Better RANK in Your Exam?
Start Your Preparations with Eduncle’s FREE Study Material
- Updated Syllabus, Paper Pattern & Full Exam Details
- Sample Theory of Most Important Topic
- Model Test Paper with Detailed Solutions
- Last 5 Years Question Papers & Answers
Sign Up to Download FREE Study Material Worth Rs. 500/-
Dhairya sharma![best-answer]()
The main reason behind it the heating effect of the apparatus. in Ac equipment there is chance of heating , and we know power dissipated is the square of the current, so to avoid or say reducing heating effect ac equipments aren't marked equally spaced in division scale.
while in Dc apparatus we use concept of magetic coil so no such loss.