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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
Why is sinusoidal input and sinusoidal output preferred in frequency changers?
Such a signal is optimal for use with electrical transformers and household appliances. When you simply chop up DC current and send it through a transformer, that is a square wave, and square waves don't help the life of the transformer. Depending on the length of the cycle and the load, that could cause the transformer to get hot.
Where can one purchase a voice transformer?
Other Land Toys is a website which sells voice transformers. They can be ordered and shipped to The UK, The USA and over 50 other countries throughout Europe and the rest of the world.
Where are very large scale integrated chips used?
it can be able to more than 1 lakh transistor in a single chip. so area required is very less and cost is reduced.
Why is a three phase induction motor also known as a squirrel cage induction motor?
If you ever had a hamster as a kid, visualize the wheel that it used to exercise on. When the iron portion of the motor's rotor is removed this is the overall shape of the conductors embedded in the rotor. It is in this winding that the current is induced into. This in turn creates a magnetic field in the rotor that locks onto the revolving magnetic field in the stator. As for the terminology, a hamster cage induction motor does not convey the image of a motor that can do any heavy work. Its all about the spin, a squirrel is larger and stronger than a hamster and I guess that is about the largest caged animal that can use a wheel for exercising.
Additional Comment
At the time when 'squirrel cage' motors were developed, people kept squirrels (rather than hamsters or gerbils) as pets.
Hz = hertz ,which is a measure of frequency. It is equivalent to cycles per second. Your home power is 60 Hz if you live in USA.
What do you understand by technical current direction?
Current in metal conductors is normally termed either 'electron flow' or 'conventional flow'. I'm not aware of the term, 'technical current'.
'Electron flow' assumes that current is a flow of free electrons through the conductor, from a negative potential to positive potential.
'Conventional flow' (also known as 'Franklinian flow', after Benjamin Franklin) predates what we know about the atom, and was based on the assumption, by scientists such as Franklin, that current was a flow of some mysterious 'fluid' from a higher pressure ('positive' pressure) to a lower pressure ('negative' pressure).
Some textbooks assume 'electron flow', whereas most assume (for no accountable reason!) 'conventional flow'. At least one textbook I know of has been published in two versions: an 'electron flow version' and a 'conventional flow version'!
As the source impedance is equal to load impedance, it is assumed that both the resistances are in series. This distributes the whole voltage equally between both the impedance. Hence the PD across external resistance will be 1V.
Where might one purchase Phase 3 Phonics?
There are many different books from different learning brands which will be labelled as 'Phase 3'. You will probably be able to find a wide range of books to choose from at your local bookstore.
Whrite a Breif note on moving coil microphone?
A moving-coil microphone contains a diaphragm exposed to sound waves. The diaphragm carries a coil placed in the magnetic field. The voltage induced in the coil is proportional to its amplitude of vibration, which, in turn, depends on the sound pressure.
Moving-coil microphone. AP = acoustic pressure, Uo = output voltage, 1 = diaphragm, 2 = coil, 3 = permanent magnet, 4 = protection grid, 5 = case. Cheers ebs
Absolutely. This is acceptable as long as your charger is built for the type of battery used, and the voltage is right. AGM, flooded, GEL, Ni-Cad, and Lead Calcium are typical solar batteries. This battery charger can determine which is which.
http://www.bdbatteries.com/chargers.php?id=7
Basics:
Think of a battery as an electricity tank.
Just like your hot water heater (a water tank) it cares not where the power comes from.
The hot water heater only requires water at the right pressure (voltage) to fill the tank, and not burst it. The rate at which the tank is filled (aka size of the hose) is irrelevant to ability to fill it up. However, the size of the incoming hose has everything to do with how long it takes to charge or discharge the tank.
How To:
Now back to your problem. Assuming your system is 12 volts. Your solar panels are one hose into your power tank at roughly 13.1 volts. The max charging rate for that system if 14.4 volts. The hose isn't as big as possible coming from the solar panels, and when there is no amps (water) coming down the wire (pipe), the battery (tank) is left under charged. To augment the power production, simply hook up any battery charger, the higher the amp rating on the charger, the faster it charges the battery.
Neat trick:
Jump start it with your automobile for 30 minutes. Drive to the gate, without shutting off the vehicle, attach the jumper cables to the battery Positive and the frame. The alternator has a rating of between 80 and 150 amps :) it can charge an 80ah battery in under an hour.
Source: http://www.bdbatteries.com
How do you get a copy of bachelor's degree?
go to art institute and get a art degree lol just playin idk really
How did the agriculture revolution affect the Industrial Revolution?
Affected live stock breeders and their methods
What is the difference between electrical and electronics?
Electrical Circuit:
An Electrical circuit is that which is a connection of conductive wires and other devices whereby the flow of electrons occurs.
Electronic Circuit:
An Electronic circuit is that which contains at least one active element in a single circuit; whereby the flow of electrons is controlled by another electrical signal. (either voltage or current)
In short, an electronic circuit is that in which electricity controls electricity...
What is the difference between a two brush and a four brush starter motor?
the reason for brushes is to makethe motor revolve. The more brushes probably make a more powerful starter motor
This is also known as phantom power or vampire power. Even though an electric device is turned off, it is still drawing a small amount of power. A television, for example, continues to draw power so that it can sense the remote control to turn it on, or to keep the time.
Other examples are chargers left plugged in for telephones, video games, etc.
What causes generators in parallel with same voltages and KW to have different amps?
If they are at the same voltage, and the same kW, the only thing left that will influence the output amperage is the power factor the generator is running at.
Is there a 120 AC dimmer switch wiring diagram for 24 volt DC motor?
The output of a 120 volt dimmer switch will be an AC voltage so should not be used on a DC motor.
Can you use a potentiometer to adjust the voltage on a dc motor that works between 9 - 18 V?
Probably not, at least not directly...
Potentiometers can be used to vary the voltage in a circuit, but they typically do not have a large power rating. Most DC motors, even small ones, pull enough power to overheat a potentiometer.
What is the purpose of isolation transformer?
An isolation transformer (or more commonly, amplifier) reduces noise in the system from the power source. This is especially necessary in medical applications where the signals that are being read are very tiny and even a small amount of noise can disrupt a signal and make it unreadable.
What is the safe isolation procedure for a single phase motor fed of a distribution board?
Isolate the circuit feeding the motor at the distribution board and lock off or tag at the board so the motor cannot become live while being worked on. Unplug the motor and tag it suitably. Discharge any capacitors fully before servicing. Use your meter, Prove- Test- Prove.
What value of kvar in 25 hp motor?
Use a voltmeter and ammeter to measure the supply voltage and load current drawn by the motor. The product of these two readings will give you the apparent power in volt amperes. Then use a wattmeter to determine the true power of the machine, in watts. The reactive power, in reactive volt amperes, will then be the vector difference between the apparent power and the true power.
4hp = 1 KVAR, so for 25 hp, 25/4= 6025 KVAR
The operating torque required to turn some fan or impeller which sucks in some gas or liquid to some engine or pump etc.
