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## Under the Hood of LEDs (Light Emitting Diodes)

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# Archive: Category «Electrical Lectures»

Electrical Lectures

# Superposition Theorem Used To Solve The Simple Network

Using Superposition theorem, find the current through the 2Ω resistor of the network of Figure 1 above. The presence of three sources will result in three different networks to be… Read more

Apr 30, 2016 | By Edvard

Electrical Lectures

# Electric Circuits? It’s All About Nodes, Branches, and Loops

Since the elements of an electric circuit can be interconnected in several ways, we need to understand some basic concepts of network topology. To differentiate between a circuit and a… Read more

Apr 23, 2016 | By Edvard

Electric Motor

# Two Basic Methods Used For Braking a Motor (DC Injection and Dynamic)

Two common basic methods used for braking a motor are DC injection braking and dynamic braking. We will look at both in detail, starting with electric braking. DC Injection Braking… Read more

Apr 18, 2016 | By Edvard

Electrical Lectures

# Why do we care so much about power factor correction?

Power factor, as every electrical engineer should know, is defined as the ratio of real power to volt-amperes and is the cosine of the phase angle between the voltage and current in… Read more

Apr 15, 2016 | By Edvard

Electrical Lectures

# AC versus DC. Those were the days…

Take warning! Alternating currents are dangerous. They are fit only for powering the electric chair :) The only similarity between an AC and a DC lighting system is that they… Read more

Apr 13, 2016 | By Edvard

Electrical Lectures

# What Is The Energy, But For Real?

Energy is best defined as “the capacity for doing work”. Electricity is but one of many forms of energy. Other familiar forms of or descriptions of energy are thermal or… Read more

Apr 08, 2016 | By Edvard

Electrical Lectures

# How rotating magnetic field works in AC machines

The fundamental principle of operation of AC machines is the generation of a rotating magnetic field, which causes the rotor to turn at a speed that depends on the speed… Read more

Mar 23, 2016 | By Edvard

Electrical Lectures

# Reactive Power and Compensation Solution Basics For Students

The total power, the so-called apparent power, of a transmission network is composed of active and reactive power (Figure 1). While the power consumers connected into supply transform the active… Read more

Feb 17, 2016 | By Edvard

Electrical Lectures

# 2 approaches to analyse and solve series parallel networks

A firm understanding of the basic principles associated with series and parallel circuits is a sufficient background to begin an investigation of any single-source DC network having a combination of series… Read more

Jan 01, 2016 | By Edvard

Electrical Lectures

# Basic PLC program for control of a three-phase AC motor (for beginners)

While the lighting control system previously discussed is useful to explain basic PLC operation, a more practical, and only slightly more complex, application is start-stop control of an AC motor…. Read more

Dec 25, 2015 | By Edvard

Electrical Lectures

# The Mesh Current Method For Analysis Of Electric Circuits

The mesh current method of circuit analysis discussed in this technical article employs mesh currents as the independent variables. The idea is to write the appropriate number of independent equations,… Read more

Nov 25, 2015 | By Edvard

Electrical Lectures

# The Node Voltage Method For Analysis Of Electric Circuits

Node voltage analysis is the most general method for the analysis of electric circuits. In this technical article, its application to linear resistive circuits is illustrated. The node voltage method… Read more

Nov 02, 2015 | By Edvard

Electrical Lectures

# Basic measuring devices explained through cute simple schemes

In this technical article, you should gain a basic understanding of the desirable properties of practical devices for the measurement of electrical parameters. The measurements most often of interest are… Read more

Oct 21, 2015 | By Edvard

Electrical Lectures

# 10 Important Definitions Applied To Low Voltage Fuses

The simplest of all overcurrent protective devices are fuses. A fuse is an overcurrent protective device with a circuit-opening fusible part that is heated and severed by the passage of the… Read more

Oct 10, 2015 | By Edvard

Electrical Lectures

# Voltage Drop Calculations For Engineers – Beginners

Voltage drop calculations using the DC-resistance formula are not always accurate for AC circuits, especially for those with a less-than-unity power factor or for those that use conductors larger than 2… Read more

Sep 19, 2015 | By Edvard