# Archive: Category «Electrical Lectures»

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# Every car has it – The Lundell generator with claw-pole rotor

Increasing comfort and safety in cars, trucks, and buses driven by combustion engines require more installed electric power on board. As of now, the Lundell generator (claw-pole rotor generator) is the… Read more

May 06, 2016 | Edvard

# 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 | Edvard

# 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 | Edvard

# 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 | Edvard

# 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 | Edvard

# 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 | Edvard

# 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 | Edvard

# 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 | Edvard

# 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 | Edvard

# 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 | Edvard

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