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Dc machine consists of the following parts:
Field system: The object of the field system is to make a uniform magnetic field, within which the armature rotates. It having of four parts- yoke, pole core, pole shoe and field -coils.
Armature core: It houses the armature conductors or coils and causes them to rotate and as cuts the magnetic flux of field magnets
Commutator: The commutator is a type of rotating switch placed among the armature and external circuit and so arranged that it will reverse the link with the external circuit at the instant of every reversal of current in the armature.
Brushes and Brush gears: The function of brushes is to collect current from the commutator and supply it to the external load circuit. The brushes might be of carbon, graphite, copper, metal graphite, carbon graphite
Can several fibers gives the same amount of light? No, some fibers do not give similar amount of light. If a no. of fibers or light guides are coupled similar illuminator, this
Theory of bi prism
Capacitors: When a voltage is applied to a capacitive circuit there is a change in the electric flux. The ease with which this change takes place is a measure of the capacitan
Universal age paradox Two most straightforward methods of computing the age of the Universe through redshift measurements, and stellar evolution yield incompatible results. Re
A measuring jar or graduate Select several straight-sided glasses jars of assorted sizes. Olive bottles are very useful for the making of graduated cylinders. Paste a strip of
A balance trick Get a smooth metre stick and let it rest lightly on your two forefingers. Place your fingers near the ends of the stick and then move them in the direction of t
Total height of the gymnast just before falling back down is=(2+.3)=2.3m Energy gained at that point = m*g*h(m=mass, g=gravitational force, h=height) =55*9.8*2.3=1239.7 J
construction and working of nicol prism
Heat is the energy that is operated because of differences in temperature among the body and the surrounding. The unit of heat energy is Joule. The basic difference among study
project of class12,,to demonstrate electrostatics shielding
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