Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

What is Electrical Resistance?Resistance (also known as ohmic resistance or electrical resistance) is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω).The larger resistance, the greater the barrier against the flow of current.When the potential difference is applied to a conductor, the current starts flowing, or the free electrons start moving. While moving, the free electrons collide with the atoms and

Electricity is the most common form of energy. Electricity is used for various applications such as lighting, transportation, cooking, communication, production of various goods in factories and much more. None of us exactly know that what is electricity. The concept of electricity and theories behind it, can be developed by observing its different behaviors. For observing nature of electricity, it is necessary to study the structure of matters. Every substance in this universe is made up of ext

There are some inventions that changed human civilization. The first invention was the wheel, the second invention was electricity, the third invention was telecommunications, and the fourth invention was the computer. We will discuss the basic introduction of electricity. Each substance in this universe is made of plenty of atoms and each atom has the same number of negative electrons and positive protons.As a result, we can say that each neutral substance has the same number of electrons and p

Voltage and current are two basic parameters of an electric circuit. But, only voltage and current are not sufficient to express the behaviour an electric circuit element. We essentially need to know, how much electric power, a circuit element can handle. All of us have seen that a 60 watts electric lamp gives less light than a 100 watts electric lamp. When we pay electric bill for electricity consumption, we are actually paying the cahrges for electric power for a specified period of time. Thus

Units are defined as those tools using which we can measure any physical quantities effectively. For example, if we want to measure length then that can be measured in meters, centimeters, feet etc, again if we have to measure mass then that can be measured in kilograms, grams etc. So from the above example we can say that there are many units which can be used to measure a particular quantity.Now if we take the other physical quantities also then there are many units available for a particular

Drift velocity is defined as the net velocity of a particle that undergoes random changes in direction and speed. This concept is typically associated with free electrons moving within a conductor. Imagine these free electrons traversing the conductor with arbitrary speeds and in random directions. When an electric field is applied across the conductor, the haphazardly moving electrons encounter an electrical force aligned with the field direction.This applied field, however, doesn’t curtail the

AC circuits are usually three-phase for electrical distribution and electrical transmission purposes. Single phase circuits are commonly used in our domestic supply system.The total power of a three-phase AC circuit is equal to three times the single phase power.So if the power in a single phase of a three-phase system is ‘P’, then the total power of the three-phase system would by 3P (provided the three-phase system is perfectly balanced).But if the three-phase system is not exactly balanced, t

Similarly, the potential difference between two points is defined as the work required to be done for bringing a unit positive charge from one point to other point.When a body is charged, it can attract an oppositely charged body and can repulse a similar charged body. That means, the charged body has ability of doing work. That ability of doing work of a charged body is defined as electrical potential of that body.If two electrically charged bodies are connected by a conductor, the electrons st

What is Electric Charge?Every matter in this universe is made of atoms. The atoms are electrically neutral. This is because, each atom has equal number of protons and electrons. Protons have positive charge. In an atom, protons sit in the central nucleus along with electrically neutral neutrons. The protons are strongly bounded in the nucleus.So, protons cannot be detached from the nucleus by any normal process. Each electron revolves round the nucleus in definite orbit in the atom. Electrons ha

These are the questions which come in our minds every time when we are dealing with AC circuits.Suppose, we have a simple DC circuit (figure – 1) and we want to replicate it in an AC circuit. We got every thing same, except supply voltage which is now to be an AC supply voltage. Now, the question is what should be the value of AC supply voltage so that our circuit works exactly same as that of DC.Let us put same value of AC supply voltage (AC Vpeak = 10 volt) which is in our DC circuit. By doing