Electrical And Electronics

If you want to know all about electrical and electronics engineering – you’ve come to the right place.

Theory4power.com dedicated to teaching and sharing all subjects associated with electrical and electronics engineering.

Table of contents

safe working methods

Safe Working Methods

Electrical and electronics work is a deadly risky job. A little carelessness can be the cause of a big accident. So we who are involved in electrical work will always try to adopt safe working methods. Here we will discuss safe working methods such as: –

Possible causes of accidents, safety conditions, and warnings, accident prevention equipment in electrical work, first aid, first aid requirements, first aid equipment, electric shock, how much current flows in the human body, the way electricity flows, Fire, Types of Extinguishers, etc.

hand tools

Hand Tools

Different types of hand tools are used in electrical and electronics work. Tools that help us get things done easily. Here we will discuss all the tools such as –

Hand tools maintenance requirements, the name of the equipment used in electrical work, a description of all the work used, etc.

basics of Electrical Engineering

Basic Electricity

Here we will discuss the basics of Electrical and Electronics Engineering in a consistent manner, such as –

Matter, elemental matter, compound matter, atom, electron theory, electricity, static electricity, electromotive force, voltage unit, current, resistance, regulator, Ohm’s law, electrical circuit, series-parallel circuit, Karshaf’s formula, etc.

electrical conductors and insulators

Electrical Conductors And Insulators

All components used as electrical and electronics conductors and insulators will be discussed in detail here: –

Silver, Copper, Aluminum, Iron and Steel, Copper clad Steel, Aluminum clad steel, Metals with general insulation, Mica, Mica Knight, Glass, Porcelain, Rubber, Paper, Silk, Polyvinyl Chloride, Asbestos, Oil, Wire & Cable,

Weatherproof Wire, Underground Cable, Wire Gauge, Micrometer, Wire Size, Cable Grade, Wire & Cable Code, VIR. And PVC. List of the current-carrying capacity of wires, etc.

joint and soldering

Soldering, Power, And Energy

Here we will give you clear information about joint and soldering, electric power and energy such as: –

Classification of joint, wire and cable joint, requirements of its joint, proper connection of wires, requirements of soldering, soldering method, warning, electric power. , Kilowatt and horsepower, heating action due to electric current flow, energy, watt-hour, BOT unit, electrical device, switch, main switch, socket, fuse, circuit breaker, fuse and wire size, etc.

Magnets and magnetism

Magnet and Magnetism

Magnets and magnetism are an integral part of electrical engineering, we will discuss this topic here as: –

Magnet pole, magnet classification, magnet classification, use of the permanent magnet, the difference between permanent and temporary magnet, magnetic field, magnetic force line, magnetic flux, magnetic force, magnetic field Induction, magnetic axis, magnetic neutral axis, retentivity, electrical and electronics,

and magnetic matter, magnetic results as a result of electric current, corkscrew, or Maxwell’s law, Determination of current and magnetic flux by a right-hand mustache, the magnetic field of the solenoid, use of electromagnets, electromagnet, left-hand rule of framing, electromagnet,

Induction, lens needle, Fleming’s right-hand rule, coil left-hand rule, dynamically obsessed e. M. F, statically obsessed e. M. F, shelf obsessed e. M. F, inductive circuit, use of self-inductance, mutual inductance, use of mutual inductance, magnetic hysteresis, eddy current, magnetic circuit,

magnetic conductor force, reluctance in a magnetic field, reluctance in magnetic, Given, Magnetic hysteresis, diagnostics of hysteresis, electromagnets of a magnetic field, wave power of electromagnets, use of thread, etc.



In this chapter, Illumination will be discussed Such as – Incandescent Lamp, Lighting System, Light Reflection, Light Unit, Lamp Classification, Halogen Lamp, Arc Lamp, Gas Discharge Lamp, Mercury Iodine Lamp, Sodium Vapor Lamp, electrical and electronics,

Rule Lamp, Fluorescent Lamp, Fluorescent Lamp Advantages and Disadvantages, Fluorescence Lamp CircuitsCapacitor work, starter work, thermal starter connection Chie, faults and remedies of fluorescent lamps, list of different lamps, list of lights by location. The power of different lamps was given in watts to illuminate the rooms of the building, etc.



Let’s talk about earthing here likePurpose of earthing, the purpose of earthing equipment, where to do earthing, earthing electrode, pipe electrode for maximum 20 kW 400 volts, protection of earthing lead, voltmeter and ammeter method, three-point method, earthing testing method, warning,

low chart The highest acceptable value, Two earthing, chart of what type of earthing should be done for different power motors, earthing continuity wire, earthing goods, earthing method, earthing leakage circuit breaker, earthing leakage breaker structure, earthing leakage circuit breaker procedure, etc. L. C. B

AC Generator

A.C. Generator

In this chapter, AC Generator will be discussed Such as – Principle of the alternator, the structure of the alternator, the voltage equation of the alternator, a. C. Field accretion method of the generator, the distribution factor and pitch factor, load properties, synchronizing alternator, synchronizing method, load distribution among alternators, etc.

DC generator

D. C. Generator

In this episode, we will discuss the DC generator like: –

A.C. Basics of generators, commutators, and brushwork, basics of direct current, d. C. The working method of the generator, d. C. The names of the different parts of the generator d. C. Fieldwork of the generator, work of armature, d. C. E. of the generator. M. F. Equations of, e.g.,

field excitation, d. C. Classification of generators, Separately excited d. C. Generator, Self Excited d. C. Generator, Series Generator, Shunt Generator, Compound Generator, Armature Reaction, Compensating Wilding, Interpol,

Interpol Polarity, Computation, d. C. Generator Features, Use of Voltage Regulator, Generator Load, Waste Efficiency, E.g., d. C. The reasons why the voltage of the generator is not generated, the reasons that the voltage drops with the time of loading, the voltage. Reasons for non-maximization, alternating and direct current detection methods, and polarity testing, etc.



The transformer is an integral part of electrical engineering, we will discuss this topic here as –

Primary and secondary wiring, the principle of the transformer, what happens when secondary wiring is connected to load, work of transformer, classification of the transformer,

current transformer (C, T), classification according to different functions of the transformer, voltage transformer, transformer, PT. -Delta connection, star-star connection, delta-star connection, star-delta connection,

transformer ratio, example, transformer dissipation, Efficiency of the transformer, voltage regulation of transformer,

the structure of oil-filled transformer, cooling method of the transformer, e.g. M. F. Equation, Example, Transformer Testing, Continuity Test, Transformer Insulation Test, Transformer Polarity, Three-Phase Transformer Polarity Test, Transformer Voltage Prop Test,

Open Circuit Test, Short Circuit Test, TransformDifference between three-phase transformer parallel, core type, and cell type transformer. ‍CHA of various connections of three-phase transformers. Auto Transformer, Open-Delta or VV connection, Scott connection, or Teaser connection.

Induction motor

Induction Motor

Induction motor is an integral part of electrical and electronics engineering, we will discuss this topic here as-

Rotating magnetic field, how to generate rotating magnetic flux by the 3 – phase current, induction motor, the principle of induction motor, a. C. Motor, Squirrel Cage Motor, Slip-Ring Motor, Name of different parts of Slip-Ring Motor, Slip-Ring Type Rotor,

Advantages and Disadvantages of Slip-Ring Motor, Torque, Starting Torque, Running Torque, Slip, Rotor Frequency, Induction Motor Speed Change, Characteristics of induction motor, example, etc.

DC  Motor

D.C Motor

In this episode, we will discuss DC Motor like –

D. C. Motor torque generation method, d. C. Motor class, d. C. Basics of the motor, series motor, shunt motor, compound motor, use of the cumulative compound motor, use of the differential compound motor,

motor torque back e. M. F. Armature current, d. C. Motor reversal, D. C. The need for a motor commutator, d. C. Motor faults and remedies, d. C. Use of the motor, etc.

Single Phase motor

Single Phase Motor

Single Phase motor is an integral part of electrical engineering, we will discuss this topic here as –

Basics of single-phase motor, single-phase induction motor, stator phase split motor, capacitor start induction motor, centrifugal switch operation, capacitor start and run the motor, fan calculation according to room, capacitor working, capacitor working, motor capacitor Run motor, sided pole motor, different parts name, electronic engineering,

Pole saving reasons, faults, and remedies of sedated motor, a. C. Series motors, (1-phase), single-phase universal motors, faults, and remedies of universal motors, repulsion start induction motors, synchronous motors (1-phase). Differences between synchronous and induction motors, current rating of electric circuits lick, example, etc.

Motor starter

Motor Starter

Let’s talk about Motor starter here like –

Starter function, motor nameplate information, motor starter requirements, D, C Motor starter, D, c. Formation of starter, n. V. R. (N. V. R), and L. R. L. R) Three-end starter, four-end starter, series motor starter,

controllers, automatic starter, A, C. Motor Starter, Direct On Line Starter, Star-Delta Starter, Manual Starter Different Part Names, Overload Relay, No-Volt Release Coil, Automatic Starter, Auto-Transformer Starter, electronic engineering,

Auto-Transformer Facility and disadvantages, Star-delta starter motor (automatic) with the magnetic contractor, motor-star motor with magnetic contactor (push type), primary register starter,

router, router Direction change, wire and fuse size determination, e.g., magnetic contactor, Name the different parts of the magnetic contactor, overload relay, motor starter.

Armature Winding

Armature Winding

Let’s talk about Armature Winding here like – Armature Inductor, Turn, Yed Turn, Armature Coil, Coil Side, Coil Lead, Coil Goop

Coil Connection, Gup Connection, Phase Connection, Winding Pitch, Pole Pitch, Pitch Factor, Corded Wiring, Single Layer Winding, Double Layer Winding, Winding, Flat Loop Winding, Concentric Winding, Basket Winding, Chain Winding,

Concentric Chain Winding, Diamond Winding, Single Phase Motor Calculation, Example, Old Motor Re-Winding Procedure, List of Winding Materials, Insulating Material, Wire List, Wage Use Requirement, Barnishing Requirement,

Barning Requirement Method of placement, the practice of winding diagrams of motors of different slots, d. C. The name of the tow used for winding, the account of lap and wave winding, the account of winding and actual diagram, Polarity test of motor winding, electronic components,

List of different sizes of super enamel wires, Synchronous speed list, Equivalent cable size list, Motor full load current (three-phase alternating) list, Motor full load current (single-phase AC) list, List of full load current (d, c) of the motor, etc.



In this chapter, Electronic will be discussed Such as – Diodes, Semiconductor Diodes, Diode Testing Procedures, Metal Diodes, Requirement of Rectifier, Half Wave Rectification, Filter Direct Current, electrical and electronics, electronic components,

Full Wave Rectification, COLOR CORD ON RESISTANCE, e.g. Resistivity Verification Method, Resistance Test, Capacitor Function, Capacitor Test, Diode Test, Transistor Test, Good Transistor Bad Transistor, Symbol used electronically, etc.



In this chapter, Capacitor will be discussed Such as – Capacitor, Farad, Mycofarad, Class Division of Capacitor, basic electronics, Capacitor Function, Capacitor Power, Example, and Solution, etc.

Battery of electrical and electronics


In this chapter, Battery will be discussed Such as –

Cell, electrolyte, electrode, battery, cell classification, general voltaic cell, cell e. MF. Cell p. D. Charging, Discharging, General Cell Difficulty, Daniel Cell, Function Theory, Leclanche Cell, Action Theory, Drycell, MercuryDifferent parts of lead-acid battery Chemical reaction of the lead-acid cell,

battery capacity, storage battery charging, charging method, static current method, static voltage method, rectifier method, use of secondary cell, battery charging method, precautionary measures, charging a new battery Method, trickling charge, use of lead-acid cell in any place and work, basic electronics,

Cell, Cell Format, Series Format, Parallel Format, Mixed Format, Cell Mixed Format Requirement, Example, Secondary Cells, Disadvantages of the lead lead-acid cell, electrical and electronic,

secondary cell test, the efficiency of the storage battery, maintenance of the battery in the lead-acid cell, nickel alkaline cell, chemical reaction of nickel-iron cell, advantages and disadvantages of alkali cell, primary and cell differences, example, etc.

Transmission and Distribution of electrical and electronics

Transmission And Distribution

In this chapter, Transmission and Distribution will be discussed Such as – Substation, classification of substations, different voltage requirements, line diagram, 3-phase 3-wire system, 3-phase 4-wire system, 1-phase 3-wire system, electric pole or poles, pole classification, wooden pole Structure,

concrete pole structure, electric pole placement method, electric pole drying method, pulling, pulling requirement, pulling classification, List of cargo, pulling method, cross arm, cross arm requirements, cross arm classification, cross arm cargo, cross arm installation conditions, tower, tower classification, tower cargo list, connection method,

section method, insulator, insulator requirements, Types of insulators, description of insulator structure, use of insulators, methods of insulating insulators, Conductor, classification of the conductor, electronic circuit,

use and image of the conductor, method of binding it with an insulator, conductor stopping method, sag, sag measurement method, sag measurement method, sag board diagnosis, damper requirement, guard use requirement, garder classification, under bird class, Paper insulated cable structure, etc.

Advantages and disadvantages of overhead lines, advantages and disadvantages of underground lines, differences between overhead lines and underlines, cable laying method, cable joint method, cable joint qualities,

conductor preparation method, soldering method, tapping method, cabling Termination, Cargo List, Cable Wrap Removal Procedure, Swiss Gear, Swiss Gear Requirement, Circuit Breaker,

Circuit Breaker Classification, Types of Air Circuit Breaker, Air-Blast Circuit Breakers, Use of Air Circuit Breakers, Connection Methods, Well Circuit Breakers, Types of Oil Circuit Breakers, Classification of Bulk Oil Type Well Circuit Breakers, Circuit Breaker Structure, Oil Circuit Breaker Uses, Oil Requirements Types of reels, electrical and electronics,

use of reels, induction type overcurrent relay, the connection method of over current reel, lightning, arrester, Requirement of Lightning Arrester, Classification of Lightning Arrester, Horn-Gap Arrester, Horn-Gap Connection Method, bare copper conductor table, minimum wire distance from the ground, length of span, class division of voltage, etc.

Electrical Measurement of electrical and electronics

Measuring Instrument

In this chapter, Measuring Instrument will be discussed Such as – Electrical Operation Theory, Ammeter, Ammeter Classification, Ammeter Requirement, Ammeter Connection Method, Saint Requirement, Saint Connection Method, Ammeter Teaching Method, electronic circuit,

Volt Meter, Voltage Meter Requirement, Volt Meter Classification, Volt Meter Classification Meter jute taking method, the difference between ammeter and voltmeter, Wattmeter, watt meter requirement, watt meter classification,

wattmeter connection method, wattmeter reading method, whitestone bridge, whitestone bridge structure, whitestone bridge connection method, resistance measurement method, ohms meter, ohm meter, ohm meter Usage, ohms meter operation method,

ohm meter connection method, megger, megger structure, Mega Uses, Mega Procedures, Mega Connection Methods, Marilup Tests, Marilup Test Circuit Connections and Criterion Determination Methods, Induction Energy Meters, Induction Energy Meter Procedures,

Energy Meter Lessons, Induction Energy Meters, Frequency Meter Usage, Power Factor Meter, Power Factor Meter Classification, Use of Power Factor Meter, Connection Method of Power Factor Meter, Current Transformer (CT), Structure of Current Transformer, Connection diagram of Wad Meter and Energy Meter, Method of Determining Current and Voltage, Potential Transformer (PT), etc.

Ac circuit of electrical and electronics

A.C. Circuit

AC Circuit is a part of Electrical and Electronics Engineering. We will discuss different parts of the AC circuit such as: –

Intermediate current has more advantages than direct current, polyphase has more advantage than single-phase, initial term, characteristics of intermediate current, cycle, period, frequency, peak or amplitude, instantaneous, average, r. M. S. Its values, Form Faster, Peak Faster, Electrical Degree, Phase, Vester, Scalar, Phase, Infuse, electrical and electronics,

Phase Differential A. C.The position of the voltage of the CG circuit is shown, single-phase circuit, inductance, example, a circuit with pure inductance, example, a circuit with a pure capacitor, example, resistance, and circuit with an inductance (series), impedance, impedance, imp. Circuits (series), circuits with resistance, inductance, and capacitance (series),

A. C. Parallel Circuit, Chiayi A. C. The position of the current in the parallel circuit is shown, R and L parallel, the current in the circuit, the impedance of the R and L circuit, the impedance of the R and C parallel circuit, the impedance of the R.L and C parallel circuit, A, C. The difference between the apparatus and the real power of the circuit, a. C. Circuit phase displacement and power factor, power factor, low power factor results,

power factor improvement objective, leading and lagging power factor, Methods of power factor improvement, measurement of power factor, e.g., a. C. Three-phase circuit, three-phase circuit, method of connecting three-phase star, the relationship of phase current and line voltage of the three-phase circuit, the necessity of a neutral line,

determination of the power of balanced circuit connected by star, Three-phase delta connection, the difference of star-delta circuit, the relation of phase current and line current of delta connection, determination of load power of delta connection, load, etc.

house wiring of electrical and electronics

House Wiring

House Wiring is a part of Electrical and Electronics Engineering. We will discuss different parts of house wiring such as – Internal wiring, cleat wiring, casing, and capping wiring, batten wiring, batten wiring method, colloid wiring, names and pictures of colloid fittings, surface colloid wiring steps, pulling through the colloid pipe, Surface and concealed colloidal wiring method, trunking wiring,

current-carrying capacity chart according to copper and aluminum wire size, insulation resistance test of wiring, service entrance, service entry requirement conditions, general selection, service entrance cable Requirement of out-of-mind requirements, the requirement of blow-print of wiring,

electrical symbols, (layout and wiring), the layout of electrical circuits, chi, and wiring, Image of Electrical Layout Plan in House Wiring, Building Plan, etc.

Electrical Appliances of electrical and electronics

Electrical Appliances

The electrical devices we use on a daily basis include electrical appliances of electrical technology. Here we will discuss these such as – Electric heater, names of different parts of electric heater, method of replacing damaged heater element, precautions, faults and remedies of the heater, name of different parts of room heater, rod type heater, Image of Hot Plate, Image of Rotary Switch,

Names of different parts of electric range, circuit ovens of electric ovens, faults and remedies of electric ranges and hot plates, electric cookers, water heaters, immersion heaters, gasser heaters, different types of gas heaters, Fault of toaster fault, electric sewing machine, mixer machine,

electric calling bell, buzzer, electric bell with lap connection in series, Faults and remedies of calling bell, electric hair dryer, names of different parts of an electric hair dryer, requirements of a blower, use of electric iron or ironing, caution, use of asbestos and mica seat, working method of an electric thermostat, electrical welding, etc.

Refrigerator of electrical and electronics


Refrigerators are one of the most important devices in electrical technology. At present we see its use in every home. Since its use is more so its maintenance work is more. In this episode, we will discuss these such as – Refrigerator system, the concept of air conditioning system, name of the main appliance, compressor, condenser class division, evaporator, refrigerator, reel requirement, overload protector, requirement, electric circuit diagram, thermostat, thermostat,

thermostat, thermostat, thermostat, thermostat, thermostat, thermostat, thermostat Capacity of charging, refrigeration, Air conditioning (AC) operation method, electrical parts, air conditioning, charging precautions, electric circuit diagram of Wildo type air cooler. In some. Listing of cooling capacity and volume of the room,

servicing, what type of refrigerant is used in which unit. The refrigerant controlling device, refrigerant cylinder introduction, cylinder color introduction, names of some of the most common refrigerators in Bangladesh, refrigerator faults, and remedies, etc.

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