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Functions of the commutator:
A commutator is a device, which under certain conditions changes ac into dc and vice versa.
The commutator is a form of rotating switch placed between the armature and external circuit and so arranged that it reverses the links to the external circuits at the instant of every reversal of the current in the armature coil. Thus it changes induced alternating currents in armature coils into direct currents in the external load circuits.
Types of Rectifier: Half wave Rectifier: The half wave rectifier allows positive half cycle of alternating current to pass through the circuit but negative half cycle is s
Permeability of free space; magnetic constant; mu_0 The ratio of the magnetic flux density in a substance is to the external field strength for vacuum. This is equal to 4 pi x
According to Reynolds, the critical velocity (vc) of a liquid flowing by a long narrow tube is (a) Directly linked to the coefficient of viscosity of the liquid. (b) Inversel
Ionisation: If the amount of external energy is large enough the valence electron can gain sufficient kinetic energy (energy of movement) to be removed completely from its atom
It is worth noting that positive charges have lines of forces moving out from them and negative charges have lines of forces entering them.for attraction of charges one charge must
Clear definitions of, and rationale for defining variables as explanatory confounding (if required) effect modifying variables (if required) and rationale if the form
They are exactly analogous to water pressure and water flow by a hose. That's why flowing electrons is known as a current, just like a water current. Voltage is the electromotiv
(i) Meter : The presently accepted definition of meter is the length of path travelled by light in space in 1/299,792,458th second. (ii) Kilogram : Kilogram is the fundamental
What is Friction? When we think about friction, there is one more place for energy to go - heat. When you push a book across a table, does the energy of the book change? Not if
Motion of simple pendulum. Simple Harmonic Motion: It is a type of vibratory motion in which body has an immediate acceleration whose magnitude is directly proportional to the
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