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    • Capacitance
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    • Electromagnetic Induction
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      • AC Basics
      • Real Power
      • Reactive Power
      • Complex and apparent Power
  • Circuit Theory
    • Electric Circuit
    • Series and Parallel Connections
    • Faraday’s law
    • Lenz’s law
    • Ohm’s Law
    • Kirchoff’s Laws
    • Voltage Division
    • Current Division
    • Thevenin’s Theorem
    • Norton’s Theorem
    • Maximum Power transfer theorem
    • Superposition theorem
  • Machines
    • Transformers
      • Transformer Action
      • Ideal Transformer
      • EMF equation
      • Equivalent circuit and Phasor diagram
      • Voltage regulation
      • Parts of a transformer
      • Transformer tresting
      • Load losses and No-load losses
      • Types
        • Core type and shell type transformers
      • Magnetization current
      • Magnetization inrush
      • High Leg delta connection
      • Buchholz relay
      • Autotransformer
      • Selection
        • Frequently asked questions-1
        • Frequently asked questions-2
        • Frequently asked questions-3
      • Transformer noise
      • Transformer kVA calculator
      • Transformer turns ratio
    • Instrument transformers
      • Potential transformers
      • Current transformers (CT)
      • CT v/s PT
  • Power system
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TRIAC – Operation, symbol, circuits & applications

A TRIAC or TRIode for Alternating Current is a three-terminal bidirectional thyristor, meaning that can conduct current in both directions when activated properly. It is used in AC switching applications.…

Continue ReadingTRIAC – Operation, symbol, circuits & applications

Surge Protection Device (SPD) | Surge protector

A surge protection device (SPD) or simply a surge protector is a device used to ensure protection against transient surges. It is used to protect the household and commercial applications…

Continue ReadingSurge Protection Device (SPD) | Surge protector

Thyristors and their types

Thyristors are high-speed semiconductor switching devices that are made up of four layers of alternating p and n-type materials. They are used in AC/DC switching and AC power control applications.…

Continue ReadingThyristors and their types

SCR – Silicon Controlled rectifier

Silicon Controlled Rectifier (SCR) is the first thyristor ever developed (in late 1957). It led to tremendous advancements in power semiconductor devices. They are also known as phase control thyristors.…

Continue ReadingSCR – Silicon Controlled rectifier

Transformer cooling methods

Transformers are the most efficient electric machine. A typical transformer is over 99% efficient. The small inefficiency is due to copper losses, core losses-hysteresis and eddy currents losses, stray and…

Continue ReadingTransformer cooling methods

Drawout circuit breaker positions and indications explained

Several operating indications can be seen on the front of an ACB or MCCB. Being an electrician or an engineer it is important that one must understand those indication and…

Continue ReadingDrawout circuit breaker positions and indications explained

IGBT – Insulated Gate Bipolar Transistor

An insulated-gate bipolar transistor (IGBT) is a type of bipolar transistor that has an insulated gate terminal. The structure of the IGBT includes an input MOSFET which consists of the…

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Common emitter configuration of BJT

The common emitter circuit is probably the most widely used transistor configuration. The emitter electrode is common to both input and output circuits. The common emitter amplifier has a typical…

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Difference between BJT and MOSFET

BJT and MOSFET are two types of semiconductor transistors. Even though both of them are transistors, they are different from each other in various aspects. By the end of this…

Continue ReadingDifference between BJT and MOSFET

MOSFET – Structure, working principle, symbol and applications

A Metal Oxide Semiconductor Field effect transistors, commonly known as MOSFET, are semiconductor switching devices that have three terminals which are the gate, drain and source. They are unipolar transistors,…

Continue ReadingMOSFET – Structure, working principle, symbol and applications
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