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

Eddy current loss is proportional to the how much frequency, Eddy current l...

Eddy current loss is proportional to the (A) Frequency.                       (B) Square of the frequency. (C) Cube of the frequency.    (D) Square-root of the frequency.

Explain zener diode and its applications, ZENER DIODE: It is a two termi...

ZENER DIODE: It is a two terminal semiconductor junction device with a very sharp voltage breakdown at reverse bias applied. The device is utilized to give a voltage reference.

LASER, What is LASER? describe the construction and working of He-Ne Laser ...

What is LASER? describe the construction and working of He-Ne Laser with suitable diagram

Laser, what are the characterstics of laser?

what are the characterstics of laser?

Explain negative acceleration, NEGATIVE ACCELERATION OR RETARDATION OF DECL...

NEGATIVE ACCELERATION OR RETARDATION OF DECLERATION: If velocity of a body is reducing, then its acceleration is said to be negative. The direction of negative acceleration is

Law, define varigonon law

define varigonon law

Electric field characterized by the electric potential, Question: A pro...

Question: A proton a absolutely charged elementary particle is released from rest at a point in space where the electric potential is 15 volts. Following to its release the par

Describe specific charge, Describe specific charge? Desfine Thomson's exper...

Describe specific charge? Desfine Thomson's experiment to calculate e/m of an electron with relevant theory.

Newton''s 2nd Law Question, m2, 8.5 kg, is accelerating down an incline at ...

m2, 8.5 kg, is accelerating down an incline at a constant rate. m1 is being pulled by a string attached between the two masses. The coefficient of friction between m1 and the horiz

Example on diffraction, Diffraction is the spreading of light that takes pl...

Diffraction is the spreading of light that takes place when it pass through a thin slit or small hole or passes by an obstacle Answer: Diffraction is the spreading of any k

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