## What is Electric Power?

Manish Kumar Saini

Updated on 05-Jul-2021 11:03:11

Electric Power: DefinitionThe rate at which work is done in an electric circuit is known as electric power. In other words, the energy used per unit time in an electric circuit is called as electric power.Electric Power: FormulaAs, the electric power is the rate of doing work in an electric ... Read More

## Voltmeter: Definition and Working Principle

Manish Kumar Saini

Updated on 05-Jul-2021 10:02:42

A voltmeter is a measuring instrument which is used to measure voltage across the two terminals in an electrical circuit.A voltmeter has a very high resistance and it is design in such a way that when connected in parallel to circuit for measuring voltage it does not take appreciable current, ... Read More

## Types of Solid State Relay (SSRs)

Manish Kumar Saini

Updated on 05-Jul-2021 09:56:34

Depending on the applications and switching methods, the solid state relays (SSRs) are of following types −Instant ON Solid State RelayZero Switching Solid State RelayPeak Switching Solid State RelayAnalog Switching Solid State RelayInstant ON SSRsThe instant ON SSR instantly switches on the load circuit when a sufficient input voltage is ... Read More

## Transformation Ratio and Turn Ratio of Single-Phase Transformer

Manish Kumar Saini

Updated on 05-Jul-2021 09:53:59

What is Turn Ratio?The turn ratio of a single phase transformer is defined as the ratio of number of turns in the primary winding to the number of turns in the secondary winding, i.e.$$\mathrm{Turn\:Ratio=\frac{Number\:of\:Primary\:Turns(N_{1})}{Number\:of\:Secondary\:Turns(N_{2})}}$$Since for a transformer, the voltage per turn being equal in both primary and secondary windings, therefore, ... Read More

## Magnetic Reluctance: Definition, Formula & Examples

Manish Kumar Saini

Updated on 05-Jul-2021 09:52:05

The magnetic reluctance (S) is defined as the opposition offered by the magnetic circuit to the magnetic flux (ΦMagnetic Reluctance FormulaCase 1 – When physical dimensions of the magnetic circuit are knownThe reluctance of a magnetic circuit depends upon its length (l), cross-sectional area (a) and permeability (μ) of the ... Read More

## Three-Phase Induction Motor Torque-Speed Characteristics

Manish Kumar Saini

Updated on 05-Jul-2021 09:47:56

The torque-speed characteristics of a 3-phase induction motor is defined as the curve plotted between torque developed and rotational speed of the motor. It gives the information about variation in the motor torque with the change in its speed.As the torque of three-phase induction depends upon its speed but the ... Read More

## Three Phase Induction Motor – Working Principle

Manish Kumar Saini

Updated on 05-Jul-2021 09:46:06

A three phase induction motor has a stator and a rotor. The stator carries a 3-phase winding called as stator winding while the rotor carries a short circuited winding called as rotor winding. The stator winding is fed from 3-phase supply and the rotor winding derives its voltage and power ... Read More

## Three Phase Induction Motor Starting Methods

Manish Kumar Saini

Updated on 05-Jul-2021 09:44:12

There are two types of three phase induction motors viz. squirrel cage motor and slip ring motor. Both have different methods of starting, let see each of these one by one.Squirrel Cage Induction Motor Starting MethodsThe following four methods are available for starting squirrel cage motors −Direct On-Line (D.O.L.) StartingAs ... Read More

## Three-Phase Electric Power

Manish Kumar Saini

Updated on 05-Jul-2021 09:39:13

Electric PowerElectric power is defined as the rate of doing work in an electric circuit. In other words, the electrical power is the energy expanded per unit time in an electric circuit, i.e.Electric Power, $$\mathrm{p=\frac{Work\:Done}{Time}\:\:\:\:...(1)}$$The electrical power is measured in watts (W).Three Phase Electric PowerAs the single phase instantaneous power (for ... Read More

## Solid-State Relay Circuit Components

Manish Kumar Saini

Updated on 05-Jul-2021 09:33:35

A solid state relay circuit has following main components −Input Circuit ComponentsControl Circuit ComponentsOutput Circuit ComponentsInput Circuit ComponentsThe input circuit of solid state relay (SSR) is part to which the control circuit is connected and the control voltage is applied to this circuit. The input circuit of SSR performs the ... Read More