Why can a dc ammeter not read ac, Physics

Assignment Help:

Q. Why can a DC ammeter not read AC?

a) Dc ammeter can't measure ac because ac is changing continuously and periodically as well as a dc ammeter can just measure a constant current.

b) The usual moving coil dc ammeter is based on the torque generated on a current carrying loop in a magnetic field provided by a permanent magnet.

c) Ever since the current in an ac averages to zero it is changing too fast even at 60 Hz, the meter doesn't have time to respond to this because of the inertia of the coil. The average torques the coil experiences in a specified time interval is zero and hence there is no deflection.


Related Discussions:- Why can a dc ammeter not read ac

How can time delay between the different modes be reduced, How can time del...

How can time delay between the different modes be reduced? The time delay between the various modes can be reduced when (a) the rays traveling off axis to the fiber are spee

Electricity, Two tiny objects with equal charges of 71.0 µC are placed at t...

Two tiny objects with equal charges of 71.0 µC are placed at two corners of a square with sides of 0.340 m, as shown. How far above and to the left of the corner of the square labe

Explain the meaning of lasers, Explain the meaning of Lasers? Lasers us...

Explain the meaning of Lasers? Lasers use these discrete energy levels in atoms or molecules to build a large population of atoms at an excited energy level that are ready and

Free Fall, what is the acceleration due to gravity?

what is the acceleration due to gravity?

Excitation of modes in fiber, Excitation of Modes in Fiber A mul...

Excitation of Modes in Fiber A multimode fiber is used to couple light into a single mode fiber. Both fibers have the same total diameter. Explain the coupling. Use

# , what is acqustic phenomenon?

what is acqustic phenomenon?

What is magnetic permeability , It is the degree or extent by which magnet...

It is the degree or extent by which magnetic lines of force can enter a substance and is expressed by µ.

Explain the basic concept of sonar, Explain the basic concept of sonar. ...

Explain the basic concept of sonar. Basic concept of SONAR: Sonar is based ontpo the echo-sounding technique of ultrasound. While an ultrasonic wave is transmitted by water,

Calculate the density of silver, Calculate the density of silver which crys...

Calculate the density of silver which crystallizes in the face-centred cubic structure. The distance between the nearest silver atoms in this structure is 287 pm. (Molar mass of

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd