There are three basic passive circuit components – Resistor, Capacitor and Inductor. One can find the voltage drop across a resistor simply by using Ohm’s law of current electricity. In another article, we have discussed different ways to find the voltage drop across a capacitor. Here I’m going to explain the formula and polarity of … Read more
In current electricity, we became to know that the flow of electric charges is electricity. Again, from Thermodynamics, we know that heat is an energy that can flow from one part to another part of a substance. You may have noticed that a wiring of copper (Cu) wire is used in our home or office … Read more
Power factor is an important parameter of an electrical circuit. To deal with a circuit, we need to know how much power is to be supplied to its components so that the circuit works. Because the dissipation of power in a circuit may not be the same as that of real power supplied by the … Read more
We already have discussed the Power factor of an electrical circuit and how to calculate the power factor. Unity power factor can be found when an alternating voltage is applied across a pure resistive circuit. In this article, we are going to discuss the concept and formula of Unity Power factor of an electrical circuit. … Read more
Capacitor is an important component in an electrical circuit which can store electric charges. We have discussed different types of capacitors in other articles. Like other components (resistors, inductors), a capacitor also offers opposition to the current flow through it. That means it generates impedance. Ohm’s law tells us that an impedance causes a voltage … Read more
Electrical components like resistors, capacitors, inductors and their combination offer an electrical impedance to the current flow. Ohm’s law gives an expression for the impedance (resistance) of a resistor in terms of current and voltage. But how to find the impedance of an inductor? In this article, I will explore the formula for the impedance … Read more
We know that the opposition to the current flow through a conductor is called resistance. Impedance is almost the same as resistance, but with a slightly different concept. In this article, we are going to discuss the definition, units and formula for impedance in different electronic circuits. The impedances of a pure resistor, pure capacitor, … Read more
Suppose you have two carbon resistors of 2 ohms each, but you need 1 ohm resistance to connect in a circuit. What will you do if there are no other sources to collect a resistor of resistance 1 ohm? Again, what will you do if you need 4 ohms to use? Yes, we need to … Read more
In recent exam pattern of class 8, 10 and 12, MCQ and short questions carry majority marks. In this context multiple choice questions are very much important to secure a good score in exams. Students need to find MCQs from the textbooks. But most of the students fail to gather majority of inside questions. Therefore, … Read more
If an external electric field is applied across a conductor, free electrons move in the conductor. The velocities of all the electrons are not the same at every point in the conductor. Therefore, we need to consider the average value of the velocities of the electrons. It is nothing but the drift velocity. In this … Read more