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

Explain coherence, Define coherence and explain temporal and spatial cohere...

Define coherence and explain temporal and spatial coherence. Show that visibility is a maxim of coherence. Define the 'Q' factor for a spectral line. Explain coherence length and c

Determine the mass spectrograph, In the mass spectrograph, two positively c...

In the mass spectrograph, two positively charged ions having the similar velocity pass through a slit and enter a uniform magnetic field at right angles to their initial velocities

Derive second law of thermodynamics, Derive second law of thermodynamics ...

Derive second law of thermodynamics According the thermodynamics II Law,  *efficiency never be unity or never exceed unity.  *Coefficient of performance never be infinite

Are there different type of slide emitting fibers, Are there different type...

Are there different type of slide emitting fibers? Nowadays some types of side emitting fibers are marketed. Several most common given as follows: Solid core optics

Construction and working of michelson interferometer, Q.   Describe the con...

Q.   Describe the construction and working of Michelson Interferometer. Explain how you will determine the wavelength difference of two components of a line by Michelson Interferom

Telescope, Working of terrestrial telescope

Working of terrestrial telescope

What is joule cycle, What is Joule Cycle? Find the efficiency of the J...

What is Joule Cycle? Find the efficiency of the Joule cycle, consisting of two isobars and two adiabats.  Presume that the heat capacities of the gas C p and C v are constan

Dimensions, find the dimensions of the following i.power ii.velocity iii.fo...

find the dimensions of the following i.power ii.velocity iii.force

Heart, how many pumps does the heart pumps

how many pumps does the heart pumps

Define the characteristics of heterojunction laser, Define the characterist...

Define the characteristics of Heterojunction laser. Heterojunction laser: The threshold current density for homojunction lasers is extremely large because of poor optical an

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