Electrical4U 
Definition of Isolator A circuit breaker trips the circuit, but its open contacts are not visible from the outside. Therefore, it is unsafe to touch an electrical circuit by just switching off the breaker. For better safety, we need a way to visibly confirm that the circuit is open before touching it. An isolator is … Read more
What is a Single Phase Transformer? A single phase transformer is a type of transformer which operates on single-phase power. A transformer is a passive electrical device that transfers electrical energy from one circuit to another through the process of electromagnetic induction. It is most commonly used to increase (‘step up’) or decrease (‘step down’) voltage levels between circuits. A … Read more
Electrical switchgear rated up to 1kV is defined as low voltage switchgear. LV switchgear includes devices like circuit breakers, switches, electrical isolators, HRC fuses, earth leakage circuit breakers, miniature circuit breakers (MCB), and MCCBs. These components protect the LV system. The most common use of LV switchgear is in LV distribution boards. Incomer The incomer … Read more
MOSFET stands for Metal Oxide Semiconductor Field Effect Transistor. The mosfet is a capacitor operated transistor device. The capacitor plays an essential role for operating a MOSFET. We also call the device as Insulated Gate Field Effect Transistor (IGFET) or Metal Insulator Field Effect Transistor (MIFET). Why we call so we will understand when we … Read more
Wind energy simply means kinetic energy of air in motion. Air flows on the earth due to uneven heating of the earth surface by radiant energy from the sun. Wind is continuously present in many locations around the globe. This naturally occurring mechanical energy can be harnessed to rotate generators and produce electricity. Basically generating … Read more
Open and short circuit tests are performed on a transformer to determine the: The power required for open circuit tests and short circuit tests on a transformer is equal to the power loss occurring in the transformer. Open Circuit Test on Transformer The connection diagram for open circuit test on transformer is shown in the … Read more
When current flows through an electric circuit, electrons collide with atoms in the wire, causing heat. How much heat is generated depends on several conditions and parameters. James Prescott Joule, an English physicist, created a formula to explain this phenomenon accurately, known as Joule’s law. What is Joule’s Law of Heating The heat produced by … Read more
Emf Equation of Transformer EMF Equation of transformer can be established in a very easy way. Actually in electrical power transformer, one alternating electrical source is applied to the primary winding and due to this, magnetizing current flowing through the primary winding which produces alternating flux in the core of transformer. This flux links with … Read more
DC-DC converters, often called Choppers, include the Buck converter, which steps down a higher input DC voltage to a lower specified output voltage.A typical Buck converter is shown below. The input vvoltage source connects to a controllable solid-state device like a Power MOSFET or IGBT, which acts as a switch. Unlike Thyristor, which require complex … Read more
The Physics of a Semiconductor There are some materials, which have neither good conductivity nor bad conductivity of electricity. They have a moderate range of electrical conductivity. The examples of such materials are germanium, silicon, carbon etc. As the conductivity of those materials lies between good conductors and insulators, and these materials are called semiconductors. … Read more