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A VDR is a special type of resistor that changes its resistance with rise in voltage. It has a very high resistance at low voltage (below the trigger voltage) and very low resistance at high voltage (above the trigger voltage). It is also called varistor or voltage sensitive resistor. There are two types of varistor.
SILICON CARBIDE VARISTOR:-
MANUFACTURING: These are made up of silicon carbide. It is milled and mixed with a suitable ceramic binder. Then it pressed and extruded to desired shape of disc, rod or washer. Then it is sintered under controlled temperature to produce hard material. Wire leads are then connected.
METAL-OXIDE VARISTOR (MOV):
MANUFACTURING:
Zinc oxide and bismuth oxides are mixed with other powdered metal additives, pressed into discs and sintered at 12000C. It has an encapsulated polycrystalline ceramic body; with metal contacts and wire leads.
APPLICATIONS: A varistor acts as a switch. It is usually used for short circuit protection in power strips or lightning bolts "arrestors" on street power poles. It is also used as a "snobbier" in inductive circuits.
DEFORMATION IN A REAL BODY DUE TO APPLICATION OF FORCE The idea of a hard body, where the constituent molecules are fixed with respect to each other, is theoretical. Till how we
Planck radiation law A law that defined blackbody radiation better than its predecessor, therefore resolving the ultraviolet catastrophe. It is depend on the supposition that e
A lever of the first class Saw off a stick or board so that it is the similar height as a heavy desk or table in the classroom. Place another stick about the similar length on
the weight of man is 50kg in earth what is weight of man 15% of its weight in moon
If the distance between two objects, each of mass 'M', is tripled, the force of attraction between the two objects is: a) 1/2 the original force b) 1/3 the original fo
formula for maximum height.
As a longitudinal wave moves through a medium, the particles of the medium: w) Vibrate in a path parallel to the path of the wave x) Vibrate in a path perpendicular to t
prove - w2=w0+2alpha(thita-thita0)
Energy in transmitted in space in all direction. Example : Light and sound waves propagating in space.
84.1grams of He are compressed reversibly and isothermal at 100.0C from 28.0Litre to 7.37Litres. Calculate the the entropy change in joules/K.
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