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

Theory to calculate magnetic moment of a bar magnet, Illustrate ‘tan A ‘and...

Illustrate ‘tan A ‘and ‘tan B' positions of a deflection magnetometer. Illustrate the theory to calculate magnetic moment of a bar magnet and Horizontal component of the earths

Evaluate kinetic energy in oscillation, How many times the kinetic energy r...

How many times the kinetic energy reach at minimum and maximum point during one oscillation?

Illustrate about optical memories, Q. Illustrate about Optical Memories? ...

Q. Illustrate about Optical Memories? In 1983 one of the most successful consumer products of all times was introduced which is compact disk (CD) digital audio system. This CD

Suppose the sides of a closed polygam represent vector arran, Suppose the s...

Suppose the sides of a closed polygam represent vector arrangend head to tail rule , what is sum of these vectors ?

Find time needed for a net force to change the velocity, The time needed fo...

The time needed for a net force of 10 newtons to change the velocity of a 5 kilograms mass by 3 meters/second is: a) 1.5 seconds b) 6 seconds c) 16.7 seconds d

What do you mean by alloy, Q. Explain an alloy? Answer:- An alloy ...

Q. Explain an alloy? Answer:- An alloy is a homogeneous hybrid of two or else more elements at least one of which is a metal and where the resulting material has metallic

Experiment on thermo electric thermometers, what are the advantages of usi...

what are the advantages of using the thermo-electric thermometer over the mecury glass thermometer?

Determine the relative permeability of the cast steel, A closed magnetic ci...

A closed magnetic circuit of cast steel have a 6cm long path of cross-sectional area 1 cm 2 and a 2 cm path of cross-sectional area 0.5cm 2 . A coil of 200 turns is wound ar

Explain a simple theodolite or astrolabe, A simple theodolite or astrolabe ...

A simple theodolite or astrolabe A simple theodolite or astrolabe is formed by fixing a drinking straw to the base line of a protractor with sealing wax or glue. A plumb line h

Electrostatics, Can the whole charge of a body is transfer to another body

Can the whole charge of a body is transfer to another body

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