Node voltage analysis is the most general method for the analysis of electric circuits. Its application to linear resistive circuits is illustrated in this article. The node voltage method is based on defining the voltage at each node as an independent variable. One of the nodes is freely chosen as …

Read More »## Mesh Current Analysis

Another method of circuit analysis employs mesh currents. The objective, similar to that of node analysis, is to generate one independent equation for each independent variable in a circuit. In this method, each mesh in a circuit is assigned a mesh current variable and Kirchhoff’s voltage law (KVL) is applied …

Read More »## Characteristics of Network and Electric Circuit

The Oxford online dictionary defines a network as “a group or system of interconnected people or things”. In an electric network, elements, such as resistors, are connected by wires. The same dictionary defines a circuit as “a complete and closed path around which a circulating electric current can flow” or …

Read More »## Difference Between Diamagnetism, Paramagnetism, and Ferromagnetism

In order to classify materials as magnetic or non-magnetic, it must be determined whether or not forces act on the material when a material is placed in a magnetic field. If a bar of any given material is suspended in a magnetic field, it will either turn at a right …

Read More »## Difference between Conductor Semiconductor and Insulator

This article covers the key differences between Conductor, Semiconductor, and Insulator on the basis of Conductivity, Resistivity, Forbidden Gap, Conduction, Band Structure, Current Flow, Band Overlap, 0 Kelvin Behavior, and Examples. The following table covers the key Differences between Conductor Semiconductor and Insulator. You May Also Read: Difference between Electric and …

Read More »## Thevenin’s Theorem | Thevenin Equivalent Circuit | Solved Examples

Suppose that the circuit of Figure 1(a) is sealed in a black box (represented by the thick line) with only the terminals A and B exposed. A high-resistance voltmeter connected across these terminals shows that the open-circuit output voltage of the circuit is 80 V. Similarly, connecting a very low …

Read More »## Nodal Analysis with Solved Examples

Nodal analysis is a circuit-analysis format that combines Kirchhoff’s current- law equations with the source transformation. Converting all voltage sources to equivalent constant-current sources allows us to standardize the way we write the Kirchhoff’s current-law equations. For nodal analysis, we consider source currents to flow into a node. If the …

Read More »## Mesh Current Analysis with Solved Problems

Mesh Current Analysis is a technique that simplifies and speeds up writing the simultaneous equations for solving various resistance networks. The format for mesh equations is straightforward, but it cannot handle some of the networks that we can solve with the loop procedure. A mesh is a closed loop that …

Read More »## Source Transformation Example Problems with Solutions

Source transformation is a circuit analysis technique in which we convert voltage source in series with resistor into a current source in parallel with the resistor and vice versa. For a given constant-voltage source, Rint in the equivalent constant-current source has the same value but appears in parallel with the ideal current source, …

Read More »## Series-Parallel Circuit: Definition & Examples | Series-Parallel Resistors

Considered as a whole, the circuit in Figure 1 is neither a series nor a parallel circuit. However, R2 and R3 are connected between the same two points in the circuit and must have the same voltage drop. Therefore these two resistors are in parallel, and we can calculate a …

Read More »## Parallel Circuit: Definition & Examples | Resistors in Parallel

Figure 1 shows two different ways of drawing a circuit diagram for the same simple parallel circuit. Circuit diagrams usually show interconnecting conductors as either horizontal or vertical lines, as in Figure 1(a). However, to illustrate the nature of a parallel circuit, we redraw the circuit diagram by combining the …

Read More »## Series Circuit: Definition & Examples | Resistors in Series

Series Circuit Definition A series circuit can be identified by the connection between components or by the current through them. For example, in the circuit of Figure 1, R1 and R2 are connected in series because no other component or branch is connected to the junction of R1 and R2. …

Read More »## Power & Efficiency: Definition, Unit, Formula, Examples

Power is the rate of doing work. The letter symbol for power is P. The watt (W) is the Si unit of power. One watt is equal to one joule per second: 1 W = 1 J/s Equation 1 shows the relationship between power and work: \[\begin{matrix} P=\frac{W}{t} & {} …

Read More »## Linear & Nonlinear Resistor | Definition | Characteristic Curve

For most conductors, a graph of current versus voltage is a straight line, indicating a constant resistance (see Figure 1). The smaller the resistance, the steeper the slope of the graph. Definition: A resistor that maintains a constant V/I ratio is a linear resistor. As the current through a resistor …

Read More »## Parallel RLC Circuit: Analysis & Example Problems

In parallel RLC circuits the three basic components are in parallel with each other, and, therefore, all are subject to the same voltage. The current for each branch, however, depends on the impedance of the branch and can be individually determined by employing Ohm’s law. For a parallel RLC circuit, the voltage is common …

Read More »## Series RLC Circuit: Analysis & Example Problems

In a series RLC circuit, the three basic elements are in series with each other, which means that they all have the same current. The formulation covers the general case of three types of the load being present in a circuit. If any of the components is absent (usually, the inductor or …

Read More »## Capacitors in AC Circuits

When a capacitor is subject to a voltage across its terminals, it starts charging until its charge becomes at the level of the applied voltage. During the time that charging takes place a current flows in the circuit (wires connecting the capacitor to the power source). This current is due to …

Read More »## Inductors in AC Circuits

When a coil of wire (an inductor) is connected to DC electricity (Figure 1), a current is building up from zero, making a magnetic field. The wire, itself, is in that field, and therefore, a voltage is generated in it. This generated voltage is in the opposite direction of the …

Read More »## Inductors in DC Circuits

Figure 1 illustrates a simple DC circuit consisting of a resistor with which an inductor is added in series. We are interested to see what the effect of this inductor to the circuit is. The effect of an inductor in an electric circuit is always to oppose a change in the …

Read More »## Magnetism, Electromagnetism & Magnetic Materials

One of the properties of electricity is magnetism. All motors work based on this property of electricity and its effects. Magnetism Certain metals of the iron family can become magnetized if their atoms align such that this property is enhanced. This alignment can be due to contact with another magnet, …

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