The directed flow of free electrons (or charge) is called the electric current. The electric current may be classified into three main types: Steady current (DC Current) Varying current Alternating …
Continue ReadingTypes of Electric Current – Steady (DC), Varying & Alternating (AC) Current
1. A shunt generator delivers 450 A at 230 V and the resistance of the shunt field and armature are 50 Ω and 0.03 Ω respectively. Calculate the generated e.m.f? …
Continue Reading5 DC Generator Problems with Solution – Part 1
1. What is a Circuit Breaker? Circuit Breaker is a mechanical device designed to close or open contact members, thus closing or opening an electrical circuit under the normal or …
Continue ReadingCircuit Breakers – Interview Questions with Answers
Unlike Generators and Transformers, Electric Motors are rated in kW instead of kVA. We have already discussed why electric transformers are rated in kVA. This article explains why electric motors …
Continue ReadingWhy Electric Motors are Rated in kW and not in kVA?
Did you ever think about what will happen to a transformer on dc supply? In this article, you will learn why the transformer does not work on the DC supply. …
You may be amazed at why the birds don’t get shocked when they sit on high voltage overhead power lines. People often ask why don’t birds get electrocuted on power …
Continue ReadingWhy Birds don’t get Electrocuted on Touching Power Lines?
Each year in France, for example, 200 people die of electrocution and 500 suffer serious injuries, often permanent burns, respiratory paralysis, cardiac arrest, etc. The various level electric current have …
Continue ReadingEffect of Electric Current on Human Body at 50 Hz
The effects of voltage and frequency variation on the transformer is discussed in this article. Usually, power transformers are not subjected to wide frequency variations. Also, modest voltage variations occur …
Continue ReadingEffects of Voltage and Frequency Variation on Transformers
Single-phase motors are the most familiar of all-electric motors because they are extensively used in home appliances, shops, offices etc. It is true that single-phase motors are a less efficient …
Continue ReadingSingle Phase Induction Motor – Working Principle and Construction