Electricity
- The Volt The pressure that is put on free electrons that causes them to flow is known as electromotive force (EMF). ...
- The Ampere The ampere defines the flow rate of electric current. ...
- The Ohm
How to learn basic electrical?
Who this course is for:
- Electrical Engineer students or fresh graduate Engineers
- Any one who has curious to learn about wiring that is found in houses and buildings
- If you are interested to know how to read electrical drawing for a building
Which is best book to clear basics of electrical?
You can learn the following from this book so easily:-
- Mathematical calculations to understand operation of circuits
- Concepts you need to understand to design electronic circuits
- Key components of electronics like Transistors,IC’s – get a really good understanding of them.
- Understand power supplies, oscillators, amplifiers,filtering and more
What are the basic electrical questions?
Electrical Practice Quiz. Answer the questions with the given choices. The entire questions are composed of basic and board exam type questions. Answer the questions sincerely with the time allotted. The main objective of the quiz is to let the examinees... The owner hired an electrician to prepare and install the electrical wiring for his house.
What knowledge do you need to be an electrician?
Top 25 Technical terms to Know before Starting Electrician Training
- Basic Electrical Circuit Terms. Starting with the basics, electrician training means you will be learning all about electric circuits.
- Electrician Training Tools. When you start your classes in trade school, electrician tools will be important for hands-on learning.
- Electrical Units and Measurements. ...
- Working with Conduits in Electrician Training. ...
What are the basics of electrical?
Basic Electrical Concepts & TermsElectrical voltage.Electrical current.Electrical resistance.Electric power.Electric charge.Power efficiency.
What are the 3 basics of electricity?
Electricity Basics When beginning to explore the world of electricity and electronics, it is vital to start by understanding the basics of voltage, current, and resistance. These are the three basic building blocks required to manipulate and utilize electricity.
How can I learn basic electrical knowledge?
0:022:38Basic Electricity Training - YouTubeYouTubeStart of suggested clipEnd of suggested clipThere are three properties that can be found in any electrical circuit voltage current andMoreThere are three properties that can be found in any electrical circuit voltage current and resistance. Understanding how these forces work can help us stay safe on the job let's take a closer look.
What are the basic electrical Questions?
Basic electrical interview questions1: Define the term electrical engineering? ... 2: Define the principle of motors? ... 3: What is an electric shock? ... 4: How can one protect themselves from an electric shock? ... 5: What will resistances connected to a source of voltage in series do? ... 6: Define Ohm's law?More items...•
What is current formula?
The current formula is given as I = V/R. The SI unit of current is Ampere (Amp).
What is amp in electricity?
Amps: Short for ampere, an amp is the base unit of electrical current in the International System of Units (SI). Volts: The SI unit of electromotive force, or the difference of potential that would drive one ampere of current against 1 ohm resistance.
Is my house AC or DC?
AC - Alternating CurrentWhen you plug things into the outlet in your house, you don't get DC. Household outlets are AC - Alternating Current. This current has a frequency of 60 Hz and would look something like this (if you plotted current as a function of time).
What are circuit breakers?
A circuit breaker is an electrical switch designed to protect an electrical circuit from damage caused by overcurrent/overload or short circuit. Its basic function is to interrupt current flow after protective relays detect a fault.
How many laws are in electrical?
Common Terms used in Circuit TheoryNo.Description1Ohm's Law2Kirchhoff's Laws3Thévenin's Theorem4Norton's Theorem9 more rows
What is AC DC current?
Electric current flows in two ways as an alternating current (AC) or direct current (DC). In alternating current, the current keeps switching directions periodically – forward and backward. While in the direct current it flows in a single direction steadily.
What are types of electricity?
There are two kinds of current electricity: direct current (DC) and alternating current (AC). With direct current, electrons move in one direction. Batteries produce direct current. In alternating current, electrons flow in both directions.
Why DC is not used in home?
Direct current is not used at home because for the same value of the voltage, DC is more lethal than AC since direct current does not go through zero. Electrolytic corrosion is more an issue with direct current. DC inductors are more complicated. It requires commutators, electronic switches and brushes.
What is electrical wiring?
Wiring is the unseen component of your home’s electrical system. Depending upon where the wiring is located and what the applicable building codes are, the wiring in your home may be composed of non-metallic cables, metallic cables, or wiring in metal or plastic conduits. The exact types that should be used will be specified in local building codes and industry standards. It’s important to make sure that the cable you’re using is up to the task, so if you’re taking on a home improvement or expansion that involves electrical wiring, consult with a qualified electrician before beginning the job.
How does electricity come to a home?
Unless you’re partly or wholly off the grid, your electricity comes to you via your electric company’s mains. The mains can be above-ground or buried underground. But before you can use the electricity in your home, the power company needs to know how much power you’re using. That’s the job of the electric meter, which is located between the mains and your home and measures the amount of power that your home consumes. There are three types of electrical meters.
Why is understanding your system important?
Why Understanding Your System is Important. Your power company takes care of getting power to your home, but once it enters your home, everything related to your home’s electrical system — wiring, switches, outlets, fixtures — is your responsibility.
Why is it important to know the basic components of an electrical system?
People depend on electricity constantly, and when the power goes out in a storm or there's a tripped breaker or another problem in an electrical circuit, understanding the basic components of an electrical system can help you get things running again. It's also important to know who is responsible for what portion of your electrical service.
How does electricity start?
Your home's electricity starts with the power service and electric meter. The utility company's service cables (whether overhead or underground) extend to your house and connect to the utility's meter base. The electric meter plus into this meter base. The meter measures the amount of electricity your home uses and is the basis for the charges on your electric bill. The meter runs only when electricity is used in the house.
How many amps can a main breaker run?
A main breaker of 200 amps will allow a maximum of 200 amps to flow through it without tripping. In a tripped state, no current will flow to the panel. In systems without an external disconnect switch, the main breaker serves as the household disconnect.
What is a breaker in a house?
The breakers for the branch circuits fill the panel (usually below) the main breaker. Each of these breakers is a switch that controls the flow of electricity to a branch circuit in the house. Turning off a breaker shuts off the power to all of the devices and appliances on that circuit. If a circuit has a problem, such as an overload or a fault, the breaker automatically trips itself off.
What is an electrical outlet?
Electrical outlets, technically called receptacles , provide power to plug-in devices and appliances. Televisions, lights, computers, freezers, vacuums, and toasters are all good examples of devices that can be plugged into an outlet. Standard outlets in a home are either 15-amp or 20-amp; 20-amp outlets can provide more electricity without tripping a breaker. Special outlets for high-demand appliances, such as electric ranges and clothes dryers, may provide 30 to 50 or more amps of power.
What are the devices in a house?
Devices are all the things in the house that are connected to electricity, including switches, receptacles (outlets), light fixtures, and appliances. Devices are connected to the individual branch circuits that start at the breakers in the main service panel.
What is the name of the wires that connect to the breaker box?
Two large "hot" wires connect to big screw terminals, called lugs, inside the service panel, providing all the power to the panel.
What is electrical engineering?
The study of electrical engineering involves the analysis of the energy transfer from one form to another or from one point to another. So before beginning the actual study of electrical engineering, it is necessary to discuss the fundamental ideas about the basic elements of electrical engineering like electromotive force, current, resistance, etc.
What is the power of an electric appliance?
The power of an electric appliance is the rate at which electrical energy is convened into other forms of energy (e.g. heat. etc.). For example, a 60 W bulb converts 60J of electrical energy into heat and light each second.
What does ne mean in physics?
ne = np (Neutral) Thus the paper of a book is electrically neutral (i.e. paper exhibits no charge). Because it has the same number of protons and electrons. If a neutral body loses some electrons, there occurs a deficit of electrons in the body.
What is a conductor?
A conductor is one that has abundant free electrons. The free electrons in such a conductor are always moving in random directions as shown in the figure. The small electrical effort externally applied to such conductor makes all such free electrons to drift along with the metal in a definite particular direction.
How many kWh is a consumer?
The unit for billing of electrical energy is 1 kWh. Thus when we say that a consumer has consumed 100 units, it means that electrical energy consumption is 100 kWh.
How much more energy does a 100W bulb convert to?
The faster the appliance converts electrical energy into some other form of energy, the greater the electric power it has. Thus, in 1 second, a 100 W bulb converts more electrical energy into heat and light than a 60 W bulb.
When is resistance useful?
Resistance can be very useful when we have to control the flow of current. For example, consider the circuit shown in the figure. A component called rheostat has been added to the motor circuit.
What are the two types of electrical currents?
There are two types of electrical current in common use today: alternating current (AC), and direct current (DC). AC current is produced by all electric utilities. AC is very "flexible".
What are the two main classes of alternating current?
Alternating current circuits are grouped into two main classes: Single-phase (SF) and three-phase (3F). There is two phase, but its use is so minimal it will not be discussed. If there are only two wires in a circuit, it must be single-phase (not counting DC which we are not considering at this time).
How many volts are in a 115/230 volt system?
This is the ground leg. Remember, in the 115/230-volt, single-phase system, there will be 115 volts between neutral and the hot wires and 230 volts between the two hot wires.
How many hot wires are in a single phase service?
In single-phase service, two are hot wires and one is a neutral. In the usual residential or light commercial building that has three wire 115/230 volt service, the two hot wires enter the service cabinet and are fused, or use resetable overloads, but the neutral passes through the cabinet without any switch or fuse.
How does AC and DC work?
AC can be converted to DC for final use through rectifiers or solid-state devices. DC current flows always in the same direction. AC current flows first in one direction, then reverses and flows in the opposite direction. The current flow "alternates", hence alternating current.
Is 115 volt single phase?
Three-phase circuits are not designed for 115 volt single-phase use. While about 115 volts can be obtained from a hot leg to ground, using this circuitry is forbidden in electrical codes. It is a dangerous practice. There are three basic three-phase distribution systems in use today.
Is low voltage wiring cheaper?
Since the voltage and amperage is very low, wiring can be much smaller and therefore much cheaper to install than "line" voltage wiring. Low voltage is also much safer. Just as pressure of electricity is measured in volts, and the rate of current flow measured in amps, the power is measured in watts.
What are some examples of good conductors?
Copper, gold, silver, and aluminum are examples of materials that are good conductors. Copper is widely used as a conductor because it is one of the best conductors and is relatively inexpensive. Page 1-4. © Siemens Industry, Inc. 2016.
What is the relationship between current and voltage?
Ohm’s law defines the relationship between current, voltage, and resistance and shows that current varies directly with voltage and inversely with resistance.
What is the charge of a material with more electrons than protons?
A material with more protons than electrons has a net positive charge , and a material with more electrons than protons has a net negative charge. A positive or negative charge is caused by an absence or excess of electrons, because the number of protons in an atom remains constant. Page 1-7.
How many electrons are in an atom?
A hydrogen atom, for example, has only one electron and one proton. An aluminum atom has 13 electrons and 13 protons.
What is the symbol for current?
Electricity is the flow of electrons in a conductor from one atom to the next atom in the same general direction. This flow of electrons is referred to as current and is designated by the symbol “I”. Current is measured in amperes, which is often shortened to “amps”. The letter “A” is the symbol for amps.
How to find current in a parallel circuit?
Current in each of the branches of a parallel circuit can be calculated by dividing the circuit voltage, which is the same for all branches, by the resistance of the branch. The total circuit current can be calculated by adding the current for all branches or by dividing the circuit voltage by the total resistance.
What is an AC generator?
Basic AC Generator. A basic generator consists of a magnetic field, an armature, slip rings, and brushes which connect to the load. In a commercial generator, the magnetic field is usually created by an electromagnet, but, this simple generator has permanent magnets.
What is the rate of work done in an electrical circuit?
In an electrical circuit, voltage applied to a conductor will cause electrons to flow. Voltage is the force and electron flow is the motion. The rate at which work is done is called power and is represented by the symbol “P”. Power is measured in watts and is represented by the symbol “W”. The watt is defined as the rate work is done in a circuit when 1 amp flows with 1 volt applied.
What is the difference between voltage and electricity?
This force comes from either a water pump or gravity. Voltage is the force that is applied to a conductor that causes electric current to flow.
What is the relationship between current and voltage?
fundamental relationship exists between current, voltage, and resistance. A simple electric circuit consists of a voltage source , some type of load, and a conductor to allow electrons to flow between the voltage source and the load. In the following circuit a battery provides the voltage source, electrical wire is used for the conductor, and a light provides the resistance. An additional component has been added to this circuit, a switch. There must be a complete path for current to flow. If the switch is open, the path is incomplete and the light will not illuminate. Closing the switch completes the path, allowing electrons to leave the negative terminal and flow through the light to the positive terminal.
How many resistors are needed to form a series parallel circuit?
Series-parallel circuits are also known as compound circuits. At least three resistors are required to form a series-parallel circuit. The following illustrations show two ways a series-parallel combination could be found.
How are elements identified?
Elements are often identified by the number of electrons in orbit around the nucleus of the atoms making up the element and by the number of protons in the nucleus . A hydrogen atom, for example, has only one electron and one proton. An aluminum atom (illustrated) has 13 electrons and 13 protons. An atom with an equal number of electrons and protons is said to be electrically neutral.
How does an electromagnetic field work?
An electromagnetic field is a magnetic field generated by current flow in a conductor. Whenever current flows a magnetic field exists around the conductor. Every electric current generates a magnetic field. A definite relationship exists between the direction of current flow and the direction of the magnetic field. The left-hand rule for conductors demonstrates this relationship. If a current-carrying conductor is grasped with the left hand with the thumb pointing in the direction of electron flow, the fingers will point in the direction of the magnetic lines of flux.
How many poles does a magnet have?
Every magnet has two poles, one north pole and one south pole. Invisible magnetic lines of flux leave the north pole and enter the south pole. While the lines of flux are invisible, the effects of magnetic fields can be made visible. When a sheet of paper is placed on a magnet and iron filings loosely scattered over it, the filings will arrange themselves along the invisible lines of flux.