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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.
Pitch: It is the characteristics of a sound by which we can distinguish among a grave and shrill sound is known as pitch. It depends on frequency of the vibrating body and expr
In thermodynamics, the Joule-Thomson effect describes a process in which a fluid is forced through a valve or porous plug while kept insulated so that no heat is exchanged with the
Q. Illustrate what is a thermal transformation? Answer:- Chemical or else physical changes are not requiring a change in the temperature of the substance as in the formati
Electric Current: Electric current may be described as the rate of flow of charge. I=q/T Where, I = electric current q = charge T = time The unit of current i
The set of rectangular axes obeying the Newton's laws of motion and used to describe the position of a particle or an event are known as inertial frames of reference.
Why is the Kinetic energy of the system minimum in the frame of the center of mass for any number of particles solution) The kinetic energy of any entity depends on the reference
Diagram of the network looks: (b) When both x and y are large, i.e., both A and B are firing, w is increasing without bound. When one or both of x and y are small, w does n
what is newton first law of motion
For higher current rating application, resistance wires with extremely large cross sections are required. The necessary large cross sections are produced in the form of resistance
The ordered arrangements of radiations according to wavelengths or frequencies are called as Spectrum. Spectrum may be divide in two parts Emission spectrum and Absorption spectrum
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