Voltage drop across capacitor – formula and concepts

A Capacitor is one of the important components in electrical circuit. We have discussed on capacitors, their combinations and other related facts in other articles. Like other components (resistors, inductors), a capacitor also offer an opposition to the current flow through it. From the Ohm’s law, we get an expression for voltage drop across a … Read more

Impedance of Inductor formula (Inductive reactance)

In another article, we have discussed the electrical impedance of various circuit components like resistors, capacitors, inductors and their combination (LC, RLC, RC circuits). In this communication, we are going to be more specific. Here, we are to discuss the electrical impedance of an inductor coil and all related facts. Also, we will learn to … Read more

Formula for impedance in electronics (RLC & LC circuit)

Impedance is a frequently used word in electronics and physics. We already have discussed the resistance of a conductor in another article. Impedance is almost the same as the resistance. But there are some differences in presentation of impedance. In this article, we are going to discuss the definition, units and formula for impedance in … Read more

Combination of resistors in series and parallel connection

Suppose you have two resistors of resistance 2 ohm each, but you need 1 ohm resistance to use or 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 ohm resistance to use? Yes, … Read more

MCQ on current electricity for class 12 CBSE PDF

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

Expression for drift velocity of electrons in a conductor

In the application of an external electric field, free electrons move with some velocity in a conductor. The velocities of all the electrons are not equal at every point in the conductor at every time. So, we need to consider the average value of the velocity of electrons. This is nothing but the drift velocity … Read more

Kirchhoff’s law of current and voltage (KCL and KVL)

We already know that the Ohm’s law is a fundamental law in current electricity. But, Scientist Kirchhoff has given another two fundamental rules of electricity. With the help of these two rules one can easily find the current, voltage and resistance in an electrical circuit by using nodal analysis and loop analysis methods. In this … Read more

Formula for Ohm’s law of current and Voltage with graph

There are two basic laws of current electricity – one is Ohm’s law and other one is Kirchhoff’s law. Ohm’s law of current electricity gives the simplest relation between the current and the voltage across a resistance. In this article, we are going to discuss the statement and the formula for ohm’s law of current … Read more

Verification of Ohm’s Law experiment with data and graph

We have already learned the Ohm’s Law of current electricity. Now in this article, we are going to perform an experiment for the verification of ohm’s law. This practical verification is very important for the students of class 10 and 12. This is a lab based experiment to verify ohm’s law or the Ohm’s law … Read more

Electrical components used in electronic & electric circuit

An electrical circuit consists of some electrical components and source of voltage or current. These circuit-components perform all the activities in a circuit. We need to know the function of every circuit components to use these properly in a circuit. Examples of some electrical components are resistor, capacitor, inductor, diode, transistor etc. In this article, … Read more