Capacitor and the Alternating Current

Unlike the behavior of a capacitor in direct current (DC), the alternating current (AC) passes more easily through a capacitor.

Ideal Transformer

The ideal transformer is an electromagnetic device that allows to increase or decrease the alternating voltage and current while maintaining constant the power

Power Factor Definition

Power factor is the ratio between the energy that is converted into work and the electrical energy consumed in a circuit or device

The Core-laminated Transformer – Why is a Transformer Core-laminated?

Why it is not possible to use a solid iron core instead of core-laminated? What is Eddy or Foucault’s currents?

Push – Pull Amplifier

A Push – Pull amplifier is called that way, because it uses 2 groups of transistors and only one works at a time. One group pushes in one direction while the other pulls in another direction. Each group is responsible for amplifying a single phase of the input wave.

Parallel RC circuit

Voltage, Currents, Phasor diagram & Impedance. Voltage is the same on the capacitor and resistor. Current is ahead of the voltage in the capacitor

The series RC circuit.

In a series RC circuit, the current through the resistor and the capacitor is the same. The voltage VS is equal to the phasor addition of the voltage drop across the resistor (Vr) and the voltage drop across the capacitor (Vc).

Air core inductor coil inductance calculation

There are some occasions when we have an air core inductor, and we don’t know what its value is. There is an easy way to obtain the air core inductor coil inductance if you have the external measurements of this component.

What is Alternating Current?

The difference between an alternating current and a continuous current is that the continuous current flows only on one direction. The alternating current circulates first in one direction and then on the opposite one, repeating this process continuously.

Iron Core Inductor

The iron core has very special magnetic characteristics. What they do is to reinforce the magnetic field. The magnetism of the core material depends on the bias of  “the molecular magnetic domains”

What is Resonance in RLC Circuits?

Resonance in RLC Circuits is a special condition for parallel and series RLC circuits, when capacitive reactance and inductive reactance have the same magnitude and cancel each other. This only happens at frequency fo.

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.

Power in AC circuits.

Electric power. Electrical power on a circuit with reactive load (reactance).

How to obtain the current in a circuit having resistance and reactance.

What is an Autotransformer?

An autotransformer is a transformer where a part of the winding belongs to both the primary and secondary windings of the transformer. The operating principle is the same as the conventional transformer.

What is Impedance?

Impedance (Z) shows the opposition to the flow of direct or alternating current. Impedance is the vectorial addition of resistance (R) and reactance (X).