What is Joule’s Law?

It is known as Joule effect to the phenomenon by which if in a wire circulates an electrical current, part of the energy is transformed into heat. This law (Joule’s Law) is named after the British physicist James Prescott Joule.

Second Right-Hand Rule – Electromagnetism

Second Right-Hand Rule. When a current flows through a conductive wire a non-visible effect called the electromagnetic field is generated around it.

What is Electrical Resistivity?

Electrical resistivity [ρ] (rho) is a characteristic of materials and has ohm-meter unit. Resistivity indicates how much the material opposes the flow of electric current.

Why is there a diode connected in parallel to a relay coil?

The purpose of a diode connected in parallel to a relay coil (flywheel diode or freewheeling diode) is to avoid damaging some nearby components sensitive to high voltage.

How to test Diodes and how to test Transistors

Method to follow to to test a diode or transistor to know if they are working fine

What is the Impedance of a capacitor – Capacitive reactance?

The Impedance of a capacitor (Capacitive reactance) is the measure of the opposition to a change of the electrical current in this component. 

Mesh analysis in a resistor network – Mesh current method in a resistor network.

Mesh current analysis or the mesh current method is a technique used to find the currents circulating around a mesh with in any closed path of a circuit.

What is the Impedance of an Inductor?

The impedance of an inductor (also called inductance) is the measure of the opposition to a change of electrical current in this component.

What is the difference between electricity and electronics?

The difference between electricity and electronics or the difference of an electric circuit and an electronic circuit, is that in the electronics circuit, a control is exercised over the flow of the electric current.

FET characteristics

The N-channel JFET consists of a silicon bar of N-type semiconductor with two P type regions on both sides. JFET is a tri-terminal device whose terminals are called drain, source and gate.

Resistors in series and parallel How to obtain the equivalent resistor value of resistors in series and parallel. Resistors in series To implement a circuit with resistors in series you have to connect one resistor after the other one. (see the image). The equivalent resistor value of the resistors connected in series is equal to the […]

Logic AND gate The logic AND gate is one of the simplest gates in Digital Electronics. The symbols for a 2 and a 3 input AND gates are shown in the following image. The first one is the symbol of a 2-input AND gate and the second one is the symbol of a 3-input AND gate. 2-input and […]