Category: 1. DC Circuit

Star-Delta Transformations and Delta-Star Transformations allow us to convert impedances connected together in a 3-phase configuration from one type of connection to another. We can now solve simple series, parallel or bridge type resistive networks using Kirchhoff´s Circuit Laws, Mesh Current Analysis or Nodal Voltage Analysis techniques. But in a balanced 3-phase circuit we can use star delta transformation techniques…

Maximum power is transfered when the value of that load resistance is equal to the equivalent resistance of the supplying network. Maximum Power Transfer occurs when the resistive value of the load is equal in value to that of the voltage sources internal resistance allowing maximum power to be supplied. Generally, this source resistance or…

Nortons theorem reduces an electric circuit down to a single resistance in parallel with a constant current source. Nortons theorem is an analytical method used to change a complex circuit into a simple equivalent circuit consisting of a single resistance in parallel with a current source Nortons Theorem states that “Any linear circuit containing several energy…

Thevenin theorem is an analytical method used to change a complex circuit into a simple equivalent circuit consisting of a single resistance in series with a source voltage. In the previous three tutorials we have looked at solving complex electrical circuits using Kirchhoff’s Circuit Laws, Mesh Analysis and finally Nodal Analysis. But there are many…

Nodal Voltage Analysis finds the unknown voltage drops around a circuit between different nodes that provide a common connection for two or more circuit components. Nodal Voltage Analysis complements the previous mesh analysis in that it is equally powerful and based on the same concepts of matrix analysis. As its name implies, Nodal Voltage Analysis uses the “Nodal”…

Mesh Current Analysis is a technique used to find the currents circulating around a loop or mesh with in any closed path of a circuit. While Kirchhoff´s Laws give us the basic method for analysing any complex electrical circuit, there are different ways of improving upon this method by using Mesh Current Analysis or Nodal Voltage Analysis that results…

Kirchhoffs Circuit Laws allow us to solve complex circuit problems by defining a set of basic network laws and theorems for the voltages and currents around a circuit. Using Kirchhoffs circuit law relating to the junction rule and his closed loop rule, we can calculate and find the currents and voltages around any closed circuit…

Electrical Units of Measurement are used to express standard electrical units along with their prefixes when the units are too small or too large to express as a base unit. The standard electrical units of measure used for the expression of voltage, current and resistance are the Volt [ V ], Ampere [ A ] and Ohm [ Ω ] respectively. These electrical units of measurement are…

The relationship between Voltage, Current and Resistance in any DC electrical circuit was firstly discovered by the German physicist Georg Ohm. Georg Ohm found that, at a constant temperature, the electrical current flowing through a fixed linear resistance is directly proportional to the voltage applied across it, and also inversely proportional to the resistance. This…

The fundamental relationship between voltage, current and resistance in an electrical or electronic circuit is called Ohm’s Law. Basic DC circuit theory looks at how an electric circuit is an interconnection of electrical elements and that electrical current is the flow of charge, measured in amperes (A) being pushed around a closed circuit by a…