Electrical Articles Archive
Working principle of mercury vapor lamp
The extensive use of the mercury vapor lamp depends entirely upon the versatility of the mercury vapor as regards pressure, temperature, voltage and other characteristics, each change resulting in a lamp of different spectral quality and efficiency.
Working principle of fluorescent lamp
Fluorescent lighting has a great advantage over other light sources in any application. The tubes can be obtained in a verity of lengths. With illumination in a variety of colors. It is possible to active quite high
Characteristics of DC generators
Following are three important characteristics of dc generators : No load saturation characteristics (Eg Vs I f) It is also called open circuit characteristics or magnetic characteristics. It gives the relationship between no load generated emf in
What is compensating winding
This winding is used for large DC machines to reduce the fluctuations in load. Like in case of turbogenerator and rolling mill motors. Their functions are to neutralize the cross magnetizing effect of armature reaction. This compensating
Difference between lap winding and wave winding
Lap Winding Wave Winding Lap winding is suitable for low voltage and high current generator. Wave winding is suitable for high voltage but a low current generator. No. of parallel path the armature= mp(where m is a
Application of different types of DC generator
Types of DC generator Application of DC generator Separately excited generator It is used for electroplating and booster. It can be used for lighting and power purpose with field regulator. Self-excited generator (Shunt) It is used for
Explain the difference between generator and motor
Following are the difference between generator and motor Generator Motor It converts mechanical energy into electrical energy. It converts electrical energy into mechanical energy. It is based on the principle of dynamically. It is based on the
Necessity of starter
At starting, heavy current is drawn by the dc motor from the supply as some time is required by the motor to gain speed and hence to built up back emf. If the starter is not present
Characteristics of speed torque
The torque is proportional to armature current, the nature of these characteristics. At no load,Ta is no load speed. As the load is increased, torque also increases. To generate more torque, armature current also increased due to
Different types of motors
Series motor It develops very high starting torque and it has adjustable firing speed. It is suitable for any value of load which needs high starting torque. This motor is widely used in : Electric trains Cranes