High Leg delta connection

Power is transmitted over long distances at high voltage. In order to supply domestic and residential applications, it needs to be stepped down to 120V or 230V single phase. This…

Electrical wiring colour codes

Electrical engineers and electricians follow predefined wiring colour codes while wiring houses, commercial buildings and industrial panel boards. The colour codes followed is slightly different in every part of the…

Difference between NO and NC

In every control circuits and automation systems, logic is developed based on the open or closed state of switches, sensors or relays. Hence it is mandatory to know the concept…

Transformer – Working Principle, Construction and operation

Have you ever wondered how electricity generated in the countryside is lighting up your home, powering up your home appliances and electronic gadgets you use and wear? How high-tension lines…

Transformer – FAQ | Interview Questions -Part 3

What is the purpose of transformer oil? Transformer oil functions as a coolant as well as insulating material. It also enables transformer protection during internal faults. It is chemically stable…

Why is electricity transmitted at high voltages?

You might have noticed huge towers supporting the high voltage transmission lines in your locality. These high voltage lines transmit electric power generated at power stations which are situated at…

Transformer – FAQ | Interview Questions -Part -2

How does a transformer work? A transformer is an electric machine that converts AC voltage from one level to another level with minimum power loss. It is based on the…

Transformer -FAQ | Interview Questions- Part -1

What is a transformer? By definition, a transformer is a static electrical device that transforms electric energy from one level to another level. Normally transformers are used to step up…

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