Electrical4u Knowledge

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 elect

There are some inventions that changed human civilization. The first invention was the wheel , the second invention was electricity , the third invention was telecommunication s, and the fourth invention was the computer . We will discuss the basic introduction of electricity . Each substance in thi

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 beh

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 agains

What is Equivalent Resistance? The equivalent resistance is defined as a point where the total resistance is measured in a parallel or series circuit (in either the whole circuit or in a part of the circuit). The equivalent resistance is defined between two terminals or nodes of the network. Equival

What is Reactance? Reactance (also known as electrical reactance ) is defined as the opposition to the flow of current from a circuit element due to its inductance and capacitance . Greater reactance leads to smaller currents for the same applied voltage . Reactance is similar to electric resistance

There are some materials mainly metals, such as silver, copper, aluminum, which have plenty of free electrons. Hence this type of materials can conduct current easily that means they are least resistive. But the resistivity of these materials is highly dependable upon their temperature. Generally me

Resistivity or Coefficient of Resistance Resistivity or Coefficient of Resistance is a property of substance, due to which the substance offers opposition to the flow of current through it. Resistivity or Coefficient of Resistance of any substance can easily be calculated from the formula derived fr

More than one electrical resistance can be connected either in series or in parallel in addition to that, more than two resistances can also be connected in combination of series and parallel both. Here we will discuss mainly about series and parallel combination. Resistances in Series Suppose you h

What is the Temperature Coefficient of Resistance? The temperature coefficient of resistance measures changes in the electrical resistance of any substance per degree of temperature change. Let us take a conductor having a resistance of R 0 at 0 o C and R t at t o C, respectively. From the equation

A voltage source is a device that provides a constant or varying electric potential difference between its terminals. A current source is a device that provides a constant or varying electric current through its terminals. Both voltage and current sources are essential for powering various electrica

Now consider an AC circuit with two voltage sources. Here, magnitude, polarity, and phase angle are used to find the equivalent voltage. Electrical Polarity in AC Voltages In the first figure, both sources have the same polarity. Hence, the equivalent voltage is the addition of both. But these are t