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

Standing wave formation, Standing Wave Formation Below given animation ...

Standing Wave Formation Below given animation depicts two waves moving by a medium in opposite directions. The blue wave is moving to the right and the green wave is moving to

Surface mount devices, Surface Mount Devices (SMDs) are new components desi...

Surface Mount Devices (SMDs) are new components designed with soldering pads or short leads. They are much smaller in size as compared to leaded components. The SMDs are directly a

Two concentric conducting shell, Two concentric conducting shells a and b a...

Two concentric conducting shells a and b are of radii R and 2R. A charge +q is centred at their center. Shell b is then earthed and a is given charge q. Find the charge on outer su

# , what is acqustic phenomenon?

what is acqustic phenomenon?

Voltage division, Voltage division: In a series circuit Ohm's law appli...

Voltage division: In a series circuit Ohm's law applies for each component.  However, since the current is common to all components we have:           V1 = IR1,  V2 = IR2,

A body has a weight w kg on the surface of earth, A body has a weight W kg ...

A body has a weight W kg on the surface of earth. What will be its weight on the surface of moon in gravitational units of force and SI units? Ans) mass of body=W/g At moon w

How does speed is increased by using a bicycle, Using a bicycle Turn a ...

Using a bicycle Turn a bicycle upside down so that it rests on the seat and handlebars. Turn the pedal wheel precisely one turn and note the number of turns made by the rear wh

What does gravitational force depend on, What does gravitational force depe...

What does gravitational force depend on? Gravitational force depends on mass and distance. Therefore, the formula for calculating gravitational force among two objects with

Michelson interferometer, How will you determine the difference in the wa...

How will you determine the difference in the wavelengths of 2D lines of sodium light buy Michelson Interferometer

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