Difference between Earthing, Grounding and Neutral

Importance of earthing : The earthing is done to eliminate the possibility of electrocution if the live parts is accidentally touched by human being. The earthing also protects the equipment.The earthing provides least impedance path to the fault current. The three terms related to earthing are as follows.   1. Grounding 2. Earthing 3. Bonding … Read more

Operation of BJT in Active,Saturation And Cutoff Region

  The transistor can be used as a switch or as an amplifier by forward/reverse biasing the emitter to base and base to collector junctions. Based on biasing, the transistor can be operated in cut off, active and saturation region of the transfer characteristics of the transistor.   TRANSISTOR AS A SWITCH : CUT OFF … Read more

Why DC Series Motor is Used For Driving Heavy Loads?

  Why DC series motor has high starting torque?    For driving the high inertia loads, higher starting torque is required. The loads like locomotive engines, bucket elevators demand higher starting torque for the motion from its standstill position.    Construction of DC Series Motor   The DC series motor has a field winding and … Read more

Transformer Oil BDV Test

The BDV of transformer oil is breakdown voltage of transformer oil. The BDV or dielectric strength of oil is  the maximum voltage withstand capacity of the oil without breakdown. BDV test of transformer oil oil is very important for trouble free operation of transformer. Therefore, periodical testing of the transformer oil BDV is compulsory for … Read more

Schottky Diode Working and its Applications

A Schottky diode is a metal-semiconductor junction (M-S) diode that has less forward voltage drop than the P-N junction diode and can be used in high-speed switching applications. The forward voltage drop of the silicon P-N junction diode is 0.7 volt.  The forward voltage drop of the Schottky diode is 0.3 volts similar to the … Read more