Category Archive for: «Energy and Power»

Superposition Theorem Used To Solve The Simple Network

Superposition Theorem Example // 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 analyzed. Solution // Considering the effect of the 12-V source (Fig. 2): Considering the effect of the 6V source (Fig. 3): […]

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Features of 3 circuit protection devices (MCB, RCCB and RCBO) you have probably forgotten

Circuit Protection Devices Traditionally, fuses were the main devices chosen for final circuit protection, up until the 1970’s when circuit breaker technology started to become dominant. Today, the three principle circuit protection devices are: Miniature Circuit Breakers (MCBs), Residual Current Circuit Breakers (RCCBs) and Residual Current Circuit Breakers with Overcurrent protection (RCBOs) Miniature Circuit Breakers […]

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

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 network, we may regard a network as an interconnection of elements or devices, whereas a circuit is a network providing one […]

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What Would Be The Worst Type Of Three Phase Faults (And Why It Happens)

When Three Phase Faults Occur… In a three phase power system, the type of faults that can occur are classified by the combination of conductors or buses that are faulted together. In addition, faults may be classified as either bolted faults or faults that occur through some impedance such as an arc. Each of the basic […]

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3 Designs of DC Distribution Systems In Power Substations

DC Distribution Systems The method of connection of the battery, battery charger, and DC distribution systems depends on the duty, the type or load, and whether the system needs to be duplicated or whether duplicate chargers are required. One typical example for a 125 V system is shown in figure 1 below. In this example, an […]

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You can use water pipes for grounding purposes, but…

Water Pipes for grounding Water pipes have been used extensively in the past as a grounding electrode. Water pipe connections are not testable and are unreliable due to the use of tar coatings and plastic fittings. City water departments have begun to specifically install plastic insulators in the pipelines to prevent the flow of current […]

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Why Do We Care So Much About Power Factor Correction?

Power factor improvement // 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 an AC circuit. These are neatly defined quantities with sinusoidal voltages and currents. Power factor can be improved by adding capacitors […]

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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 both start from the same coal pile. And thus did Thomas Edison try to discourage the growing use of alternating current electric power that was […]

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What Would Be The Best Conductor Material for Electrical Cables

Al or Cu conductor… The conductivity of copper is 65% higher than that of aluminium which means that the conductor size of similarly rated cables is proportionately smaller. Correspondingly less expense is then incurred in providing for insulation, shielding and armouring the cables themselves. Transport of the less-bulky cables is easier and so is installation. […]

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What Is The Energy, But For Real?

The basics of energy 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 heat, light, mechanical, and so on. Energy is also described as kinetic, that energy associated with a moving body, and potential […]

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