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Electrical Engineering
Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.
23,056 Questions
In a series circuit there is only one path for current to flow. The current will flow through each good lamp. If any lamp opens (blows), then the circuit is broken and current flow stops. The older strings of Christmas tree lights used to be connected in series and it was hard to fine the blown bulb. If there were two burnt out bulbs almost impossible to find.
Are solenoid valves resistive loads or inductive loads?
Resistive Load An electrical load which is characteristic of not having any significant inrush current. When a resistive load is energised, the current rises instantly to it's steady-state value, without first rising to a higher value. An electrical load in which voltage and current are converted to energy in the form of heat; i.e., an electrical heater, incandescent bulb.
Inductive Load An electrical load which pulls a large amount of current (an inrush current) when first energized. After a few cycles or seconds the current "settles down" to the full-load running current.
The time required for the curren to "settle down" depends on the frequency or/and the inductance value of the Inductive load
Can 3 phase 415 volts 60hz motor run on 460 volts 60hz supply?
If a +/- 10% service voltage variation is allowed then the 380 volts RMS "nominal" voltage could in fact vary between 342 volts and 418 volts.
Whether or not it would be safe to run a 3-phase motor, which was designed to run continuously on a 380V service, on a 415V service will depend on how closely the actual voltage which is being supplied stays to 415V because, allowing for a 10% variation either way, the actual service voltage could vary between 373.5 volts and 456.5 volts.
The lower voltage would be ok but the higher voltage would be too high such that there could be a risk of the motor overheating and/or catching on fire if the circuit breakers don't trip to shut off the current.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
The Ampere is the unit of electric current. It depends upon a voltage in order for it to occur, and the Volt is that unit. The Ohm is the unit of resistance and represents the difficulty of moving the electrons by the voltage.
What countries do maglev trains come from?
Germany and Japan are both developing maglev train technology, and are both currently testing prototypes. Japan Railway Company has designed their train to go at 311mph and carry 16 carriages (1,000 commuters). Although Germany and Japan's trains are similar, they have very distinctive differences. The German train uses electromagnetic suspension (EMS) system, and the Japanese trains use an electrodynamics suspension (EDS) system. EMS uses standard electromagnets, in which the coils only conduct electricity when a power supply is present. The EDS chills the coils at frigid temperatures, saving energy. The system used to cool these coils can be expensive though.
China is also involved with the construction of maglev trains. China is planning to build a vacuum-tube maglev train which is predicted to go 1,000 km/h. Putting the maglev train inside a vacuum tube will enable greater velocity due to decreased friction.
Although these trains will enable faster travel, they will not be available for public use until 2045.
Maglev trains are a type of high-speed train that runs on magnets supported by a magnetic field generated around the track. China, Japan, France, Germany, and Spain have maglevs.
Not counting models and test projects; one. In Shanghai, China.
What is the resistance of a cicuit if the voltage is 12v and the current is 4v?
According to ohm's law V = IR.
So here
I=V/R
=12/4
I=3A
How calculate motor max current?
There is two motors, both motors having same hp, rpm, frequency but the rpm is different. For example one motor is 5hp, 3phase, 50hz, 1440 rpm. Second motor is 5hp,3phase,50hz,3000rpm. What is the current for both motors.
The calculation of current does not depend on the rpm you just need hp and voltage. A simple formula is 1 hp = 746 watts, and current = watts divided by voltage.
The electric current flowing through a conducting material is directly proportional to the potential difference between its two ends,provided the temperature remains constant.
When temperature remains constant, the current flowing through an electric conductor is directly proportional to the potential difference across its ends.(V=IR)
device what produce dc are battrey genorators
What is the electrical term VAR?
Seeing as how this question is under Home Electricity the term VAR stands for Volt Amps Reactance.
See related links below
VAR is a term for computer distribution business. Which stands for Value Added Retailer.
Why is the current the same in all locations in series circuit?
Because the current is a flow of electrons, and those aren't created or destroyed.
The number of electrons that start out from one battery terminal is the same
number of electrons that eventually return to the battery's other terminal, after
the current has been all around the circuit. They're not necessarily the same
electrons, but the number of them is the same at both ends of the circuit, after
none have been lost and no extra ones have jumped aboard along the way.
How much elecricity does it take to power a generator?
A few Watts more output than one appliance used or a few Watts more output than The TOTAL ADDED POWER RATING OF ALL THE APPLIANCES CONNECTED TO THE GENERATOR. Usually Professional Electrical Engineers work using a simple calculation called THE DISTRIBUTION FACTOR, But to simplify matters for DIY just ADD all of the Wattage ratings together of all of the appliances and then ADD say about 20 Watts and the total is the required Wattage rating of the Generator.
Why capacitance increses in parallel?
To avoid that the plates touch each other.
The better the dielectric, the closer the plates can be, thus making the electrostatic field on the opposite plates more intense, which allows for more electrons displaced via the charging circuit to the positive plate and more incomplete atoms (positive charges) left on the negative plate.
Remember: Being the dielectric an isolator, there is NEVER current through the capacitor.
Is Voltmeter is a moving iron Instrument or moving coil instrument?
If this is a homework related question, you really should consider trying to solve it yourself before looking at this answer. Otherwise, the value of the lesson, and the reinforcement provided by the assignment, will be lost to you.
A moving coil measuring instrument has a coil attached to the indicator, surrounded by a magnet.
A moving iron measuring instrument has a magnet attached to the indicator, surrounded by a coil.
In both cases, the indicator is driven by magnetic torque caused by current flow in the coil.
Why are the compensating winding used in dc motor?
compensating winding is used for equal load sharing of two generators running in parallel. while interpole winding is used to minimise the effect of armature reaction by supporting the main field.
What is current in 230v and 50hz line?
Assuming that this question is about adapters for traveling to another country (not USA) then 230V is the equivalent of 220V. Just purchase a suitable adapter.
What does a voltage source do?
A 'voltage source' is a general term, for anything that can supply electrical power.
It can be a battery, generator, solar panel etc.
It is mentioned on schematics and other diagrams, to show where the power is applied.
How do you obtain instrument readings and compare them with circuit parameters?
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What is mean by balanced and unbalanced load?
There is a lot of confusion amongst consumers that an Unbalanced Load
Stabilizer is generally superior to a Balanced Load Stabilizer. To clarify
this myth certain fundamental principles connected with Transformers
are given below:
1. Definition of Balanced and Unbalanced loads:
a. A Three phase Loads on a 3 phase supply system is a Balanced
load because it draws equal current from each phase. Three phase
Motors, Converters; Rectifiers using 3 phase input supply are
common examples of Balanced loads.
b. A single phase / 2 phase loads on a three phase system is called
Unbalanced load. Normally Unbalanced loads have to use a
neutral wire in the system. The 2 phase loads may not require a
neutral.
What is the amps of a 5.5 kw 480 volt 3 phase?
Current in 200kw at 480 volts = 200,000/480 = 416.667 amps
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How many kilowatts does it take to run 100 amp home?
A three wire home distribution service rated at 100 amps has a wattage capacity of;From L1 to L2 at 240 volts x 100 amps = 24000 watts or 24 kilowatts. From L1 to neutral at 120 volts x 100 amps = 12000 watts or 12 kilowatts.
From L2 to neutral at 120 volts x 100 amps = 12000 watts or 12 kilowatts.
What is meant by core in electrical machine?
The armature center of a d.c. machine is typically made of overlaid sheets keeping in mind the end goal to,
(a) lessen hysteresis misfortune ,
(b) diminish armature copper misfortunes.
On each circuit draw one path that electric current could use?
This looks like a question from a student's coursework. It is impossible to answer without seeing a circuit diagram.
The actual diagram is needed to show which components are in parallel and which are in series.
If you want someone else to do your homework for you, you will either have to find out how to attach a Related Link to this question, going to a separate web page which shows the diagram, or - much better - read your course materials and answer this question all by yourself. Doing the work yourself is the only way to really learn this technical stuff!
