An electric motor is a machine that converts electric energy into mechanical energy. An electrical signal (voltage) is applied to the input terminals of the motor, and the output of the motor output generates a specific torque according to the motor characteristics. AC motors and DC motors perform the same …

Read More »## Difference between AC and DC Generator

The AC generator generates an output voltage which alters in amplitude as well as time whereas the DC generator generates a constant output voltage which does not change in amplitude as well as time. The electrical energy we utilize has two fundamental types, one is known as Alternating while the …

Read More »## Difference between AC and DC Current

Electrical current flows using two ways: either in a direct current or in an alternating current (AC). Electric current is basically the free movement of electrons by a conductor. The main difference between AC and DC is based upon the direction in which the flow of electrons occurs. DC Current …

Read More »## Difference between AC Servo Motor and DC Servo Motor

Power Source is the key difference between AC and DC Servo motors. AC servo motors depend on an AC power source whereas DC Servo motors depend on DC power source (like Batteries). AC servo motors performance is dependent upon voltage as well as frequency whereas DC servo motors performance mainly …

Read More »## Difference between Single Phase and Three Phase Induction Motor

The main difference between single phase induction motor and three phase induction motor is that single phase motors are NOT self-starting so they require some starting mechanism while three-phase motors are self-starting. Furthermore, single phase motor requires ONLY single phase supply so they produce an alternating magnetic field whereas three …

Read More »## Double Subscript Notation in Single Phase System

In single phase electric power, the double-subscript notation eliminates the need for both the polarity markings for voltages and direction arrows for currents. It is even more useful for representing voltages and currents in three-phase circuits, resulting in greater clarity and less confusion. Voltage Phasor The voltage phasor with double …

Read More »## Three Phase Star Connection (Y): Three Phase Power,Voltage,Current

Star Connection In star connections, fundamentally we connect the same phase sides to a mutual (common) point known as neutral point and provide supply to its free ends which stay thereafter as shown in figure 1. As far as line and phase voltages are concerned, they are related to each …

Read More »## Three Phase Delta Connection: Three Phase Power,Voltage,Current

Delta Connection In Delta connection, phase sides are connected in a cyclical arrangement in order to make a closed loop as shown in figure 1. As far as line and phase currents are concerned, they are related to each other as: ${{\text{I}}_{\text{line}}}\text{=}\sqrt{\text{3}}{{\text{I}}_{\text{phase}}}$ Which means that whatever supply current we have, …

Read More »## Maxwell Inductance Bridge Circuit

For measurement of inductance, the Maxwell Bridge shown in figure 1 can be employed. It is seen that the circuit of the Maxwell Bridge is simply a repeat of the series resistance-capacitance bridge, with the capacitors replaced by the inductors. Fig.1: Maxwell Bridge A disadvantage of this bridge is that the …

Read More »## Series Resistance Capacitance Bridge Circuit

One disadvantage of simple Capacitance Bridge is that perfect balance of the bridge is obtained only when Cs and Cx are both pure capacitances (i.e. they have virtually no resistive components). In general, this occurs only with capacitors that have air or mica dielectrics. Capacitors with other types of dielectric …

Read More »## Capacitance Bridge Working Principle

AC bridges are used for measurement of inductances and capacitances. All AC bridge circuits are based on Wheatstone bridge. Figure 1(a) shows the circuit of a simple capacitance bridge. Cs is a precise standard capacitor, Cx is an unknown capacitance, and Q and P are standard resistors, one or both …

Read More »## Single Phase Voltage Calculation | Matlab

Here, we will find phase voltages VAN, VBN, and VCN, shown in the following figure, using Matlab. By applying KVL, we come up with the following three equations: $\begin{matrix} 110\angle {{0}^{o}}=(1+j1){{I}_{1}}+(5+j12){{I}_{1}} & \cdots & (1) \\ 110\angle -{{120}^{o}}=(1-j2){{I}_{2}}+(3+j4){{I}_{2}} & \cdots & (2) \\ 110\angle {{120}^{o}}=(1-j0.5){{I}_{3}}+(5-j12){{I}_{3}} & \cdots & (3) \\\end{matrix}$ …

Read More »## RL Circuit Charging Discharging | Matlab

In this tutorial, we will see an inductor current behavior in an RL Circuit using Matlab. For the simplified RL circuit demonstrated below, an electric current flowing through an inductor is zero initially. At t = 0, the switch actuated from location a to b, where it stayed for 1 …

Read More »## Time Constant of RC Circuit | Matlab

In this tutorial, we will draw capacitor voltage for different time constants and analyze how it affects the charging time. Let’s assume we have a capacitor of $10\mu F$ capacitance and want to draw voltage across capacitor if: $\begin{align} & (a)R=1k\Omega \\ & (b)R=10k\Omega \\ & (c)R=0.11k\Omega \\\end{align}$ We will use the …

Read More »## Average Power RMS Voltage RMS Current Power Factor Calculation using Matlab

In this tutorial, we will calculate average power, RMS Voltage, RMS Current as well as power factor using Matlab. Let’s say we have following values of voltage and current: $\begin{align} & v(t)=10\cos (120\pi t+{{30}^{o}}) \\ & and \\ & i(t)=6\cos (120\pi t+{{60}^{o}}) \\\end{align}$ We use the following formula to calculate the RMS …

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