Differences between GTO and SCR

Gate turn-off thyristors (GTO) and Silicon controlled rectifiers (SCR) are semiconductor switching devices used in converters, rectifiers, charging circuits, etc. in order to control the current flow. This article illustrates the key differences between GTO and SCR. What is an SCR? An SCR is a unidirectional semiconductor device that can be triggered into conduction by … Read more

Ingress protection rating or IP rating (IEC 60529)

IEC 60529 has classified the degree of protection offered by an enclosure against solid particles and liquid. This classification is known as the ingress protection code/ IP code/ IP rating/ index of protection. To ensure the correct protection of the internal components and to suit the environment where the enclosure is installed, these codes are … Read more

Are earthing and grounding the same?

Ground and/or Earth are generally used to define a common reference point for power/signal. While IEC (IEV ref 195-01-01) defines this reference point as earth, IEEE (Standard Std 142-2007) defines the same point as ground and NEC defines ground itself as a connection to the earth. But are earthing and grounding the same, let’s find … Read more

Neutral-to-Earth/ground Voltage- Causes, effects, and solution

Ideally, the voltage measured across the neutral and the earth/ground must be zero. But sometimes there exists some measure of potential difference between them. Here, in this article let us analyze the causes of neutral to earth/ground voltage, its effect, and how to mitigate it. Note: If you are an electrician troubleshooting your wiring or … Read more

Electric current collectors

What are current collectors? Current collectors are components fitted to an electric equipment in motion to collect electric current required for its operation from a stationary busbar. They can be found in electric locomotives, cranes, trams, overhead conveyors, travelling cranes etc. Another place where you may see them is in those bumper cars in amusement … Read more

Interview Question – Variable frequency drives

Here are the most frequently asked interview questions on Variable frequency drives (VFD/VSD). This article aims to cover most of the interview questions on induction motors so as to prepare you to crack a job interview. Interview questions on variable frequency drives What is a VFD? Variable frequency drives/ variable speed drives/ VFD/ VSD are … Read more

Difference between Transistors and Thyristors

Transistors and thyristors are semiconductors switching devices. They are used for controlling current flow in circuits. They play a very important role in all power conversion devices. In this article let us compare and understand the difference between transistors and thyristors. The key difference between Transistors and thyristors Transistor Thyristor Basic Structure A transistor is … Read more

The difference between kVA and kVAR

The difference between kVA and kVAR is pretty simple. “kVA” is the unit of apparent power whereas “kVAR” is the unit of reactive power. Before getting into the topic, we recommend you to understand apparent power and reactive power better, by reading this: Real, Reactive, Complex, and Apparent power. Now, let us compare both of … Read more

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 circuit breaker positions. Each of those indications has some critical information regarding the current state of the circuit breaker. The following are the three most … Read more

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 article, you will know the difference between BJT and MOSFET. Bipolar Junction Transistors (BJT) A Bipolar junction transistor, commonly known as BJT, by its construction, … Read more