Spark suppression, Physics

Assignment Help:

Spark suppression:

If we consider a circuit with a large inductance, possibly one using a magnetic relay. At the instant the switch is opened, the current through the coil is changing at maximum rate, therefore the back emf induced in the coil is also at maximum.

This emf is applied to the air gap between the switch contacts and ionises the air, producing a spark which the burns the contacts. This increases their electrical resistance and radiates energy which may cause interference, therefore sparks must be suppressed. Good design of switch contacts can help, but connecting a capacitor in parallel with the switch is the best method of eliminating sparking.

When using a capacitor the energy released by the coil charges the capacitor instead of ionising air. When the switch is closed again the capacitor discharges.


Related Discussions:- Spark suppression

What is a neutron, What is a neutron? A neutron is a subatomic particle...

What is a neutron? A neutron is a subatomic particle. Neutron is one of the building blocks of the atom. It has a mass of about 1.675 x 10-27 kg. Its spin is + 1/2 and that

Occilation, if we drill a hile along the diametre of earth and drop a ball ...

if we drill a hile along the diametre of earth and drop a ball inside it then what will happen the ball will occilate or drop down in the space

Find the speed of pendulum bob, You pull a simple pendulum of length 0.240 ...

You pull a simple pendulum of length 0.240 m to the side through an angle of 3.50 degrees and release it. a) How much time does it take the pendulum bob to reach its highest speed?

Is it is possible to have charge of 7.2*10^-19 c?, No;(Personal Note:Please...

No;(Personal Note:Please Rate this and let me know if this helps) Reason: From the quantisation of charge charactersistic, we can say that charge comes in integral multiple of e (

Evaluate the magnitude and direction of the total momentum, Two arrows are ...

Two arrows are fired horizontally with the same speed of25.0 m/s. Each arrow has a mass of0.116 kg. One is fired due east and the other due south. Find the magnitude and direction

Name the device used for data transmission, Name the device used for data t...

Name the device used for data transmission from single computer to an other Justify the name. Using this device draw the block diagram for data Communication and define it brief

Ultrasonics, explain briefly about piezoelectric effect to produce ultrason...

explain briefly about piezoelectric effect to produce ultrasonics

What is the band width?, A data transmission rate; the maximum amount of in...

A data transmission rate; the maximum amount of information (bits/second) that can be transmitted along a channel is called band width.

Short note on waves, Waves: A disturbance that travels by a medium is c...

Waves: A disturbance that travels by a medium is called wave.

How much pressure produced by cylinder, How much pressure produced by 6" di...

How much pressure produced by 6" diameter cylinder with height of 14" at 95 degrees Celsius

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