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 harness, What is harness? The harness applied in the industry t...

What is harness? The harness applied in the industry to explain a group of fibers or light guides, particularly terminated and with a common end. Usually, each harness should h

Determine the temperature and the entropy generation, Hexane is throttled f...

Hexane is throttled from 18.15 bar, 507.6 K to 0.1 bar.  Determine the temperature at the exit and the entropy generation. Steam is cooled under constant pressure from 400 o C,

Electron microscopy application in biology and life sciences, What are the ...

What are the electron microscopy application in biology and life sciences? Biology and life sciences as in electron microscopy application: a. Cryobiology and Cellular tomog

Newton''s ring, in newton''s rings experiment the diameter of the nth and n...

in newton''s rings experiment the diameter of the nth and n+14 rings are 3.2mm and 6mm respectively.Radius of curvature of plano convex lens is 1m.Calculate wavelength of light.

Charged particles through the circuit, Question: In that piece of a cir...

Question: In that piece of a circuit outside of any batteries or power supplies what is it that actually pushes charged particles through the circuit? Answer: By defini

Ecotourism, why does ecotourism preserve biodiversity

why does ecotourism preserve biodiversity

Explain core type transformers, Core type Transformers:   in this type of t...

Core type Transformers:   in this type of transformer the windings enclose the core (fig .given below).  Both the windings are separated and half of every winding is placed on ever

How far down is the surface of the water, A hiker tosses a rock into a cany...

A hiker tosses a rock into a canyon. He hears it strike water 4.78 s later. How far down is the surface of the water?

Fullerene structure and properties, FULLERENE: The fullerene is a cage l...

FULLERENE: The fullerene is a cage like hollow molecules composed of hexagonal and pentagonal groups of atoms, and especially those formed from carbon, that constitute the third

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