When a transformer primary is energized from a voltage source and the
secondary is opened circuited, a small current will flow in the primary. This
current is usually less than 5 percent of the rated full load value of the
transformer. Since no current flows in the secondary winding . The primary may
be considered as a coil with a large reactance due to the iron core. Thus
causes a small current .
But when load is applied to the secondary terminals. In
accordance with Lenz’s law, the current that flows through the secondary
winding must act in such a direction as to oppose the flux set up by the
primary current. When the flux is momentarily reduced, the induced emf in the
primary winding is also reduced and therefore more current flows, in the
primary winding. When more load current flows in the secondary the primary
current will again increase.flux
Friction is main bad effect of a motor. Friction reduce a motor efficiency. Friction mainly create in a motor for it’s corrosion or speed ratio on spin. In a motor flywheel adjusted in drive wheel. In a gear ratio it mainly depends on gear and flywheel transfer energy on drive wheel. In a car or heavy load carrier vehicle used spring for reduce vibration and friction reduce generally use oil especially used in lubrication. For friction reduce one should firstly should select a metal which is help to reduce corrosion that’s means high resistance corrosion. Brake is also more important issue for a vehicle for it speed is slow down. There are three types of brake such as electromagnetic, disc and drum brake. Kinetic energy change to heat energy a vehicle speed reduce. Most of the car and vehicle use hydraulic brake which based in 6 steps and depends on 6 parts. These six parts are valve, road wheel, pedal, cylinder and boost. Electromagnetic brake is more popular for it’s more fa...
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