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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
What is the use of transformer utilisation factor?
It tells us how much is the transformer utilised in a given process.
For a rectifier,TUF =(D.c.power delivered to the load)/(power rating of transformer secondary)
What ia the applicatoin of slew rate?
A: The application is for DAC ADC converters where the fastest slew rate is desirable for fast conversion
What happens if you use a 6KV motor instead of a 4KV motor on a 4KV source?
The motor will not function the way it is expected to (will really struggle to deliver the load) and over heat and likely to burn out quickly.
How do you calculate peak amplitude from phase voltage?
if you know the wave shape
the average voltage is a synonym for phase voltage
a triangle wave would have a peak that is 4 x the average
a square wave the peak is 2 x the average
a sine wave has a peak that is sqrt(2) times the average
RMS root mean squared is a way of saying that you are working with curves rather than lines and it a bit harder to find the area
AnswerUnless otherwise stated, a.c. voltages and currents are always expressed as root-mean-square (r.m.s.) values. For a sinusoidal voltage, the amplitude is 1.414 times the r.m.s. value. For example, the amplitude of a 120-V supply is 170 V.
The average value of any alternating voltage or current, over one complete cycle, is zero.
This applies whether you are describing a phase voltageor a line voltage. The terms, 'phase' and 'line' simply describe what is being measured, not its value.
Writes the current line terminator to the standard output stream?
NET Framework Class Library writes the specified data, followed by the current line terminator, to the standard output stream.
It is meaningless. A kilogram is a measure of mass. Frequency is a measure of events through time.
-firstmate-
What is the difference between an RC CB and an EL CB?
An RC CB is a Residual Current Circuit Breaker. It is another name for something more commonly known as an RCD (Residual Current Device). An EL CB is an Earth Leakage Circuit Breaker. It is another name for something more commonly known as a GFCI (Ground Fault Circuit Breaker). For more information on these electrical safety and circuit protection devices please see the answer to the Related Question shown below.
What is the lumen loss of led lamps?
LEDs will typically reduce their light output throughout their life after an initial increase above the rated light output.
This degradation will usually be a near-linear reduction.
Well-made LEDs will not normally fail catastrophically, but drop in their output until they are no longer useful.
High quality LEDs are typically rated to drop to 70% of initial light output after 50,000 hours for white LEDs, and 100,000 hours for all other colours.
The following describes a method for using the Power Recorder to monitor and log the ripple voltage on a direct rectified DC power rail. # Set the Recorder to "Split Single Phase" # Connect N & G to the DC rail negative # Connect A to any mains input phase # Connect B to the DC rail positive
I went to go watch transformers and i liked when the robots transformed into different things.?
Wonderful. Do you actually have a question about the TFs? If it's how they do that, I can help. The Transformers are called such because they can scan a shape (usually a vehicle, though they have been know to turn into animals) and rearrange their armor and systems so they look almost exactly like that shape. I say almost because, well, they often do re-colors fo that shape, or have extra modifications (like Prowl's lazer guns that come out of his headlights, or G1 Tracks, who can fly in his car mode). They don't have to be just cars or animals, either. There are jets (the Arielbots & Seekers) spaceships (Cosmos, some Jetfires, Skylynx, Astrotrain, ect.) A TF can also have more than two forms (cue the Triple-Changers; Astrotrain, Blitzwing, Octane, Springer, Sandstorm, Broadside, and Trypicon).
If you have any other questions (especially about generations other than Revenge of the Fallen & those movies) just post 'em.
What is the difference between discrete circuits and analog circuits?
Basically an analog circuit is any circuit which uses the voltage (or current) level to deliver information (say.. a sine wave or an audio output). In contrast a digital circuit would only use a high and a low voltages (square wave, binary data transfer etc).
Discrete circuits are circuits only using basic components (resistors, transistors, capacitors etc) instead of integrated circuit packages.
A lot of discrete circuits are analog but they don't have to be. And a lot of ICs are digital but they don't have to be...
How do you compute energy loss in transmission line?
Energy loss is I^2*R losses. Calculate the transmission line resistance, and multiply by the current squared per unit time (seconds if in watt/seconds, for example).
"...The main difference between a DC generator and an AC generator lies in the manner in which the rotating coil is connected to the external circuit containing the load..."
Excerpt from: http://farside.ph.utexas.edu/teaching/316/lectures/node91.html
In other words, the commutator that the brushes contact makes the difference between AC/ (semi) DC output. You can also use electronic switching these days to get DC from AC generators.
What is the temperature when PT-100 ohmic value is 100 ohm?
If the resistance is 100 Ω and you use PT100, the temperature is O°C or 273.15K.
What are some examples of reference point?
A reference point is anything that is stationary. So, if you are on a train you know you have left the station because you moved away from the platform. Hence the platform was stationary.
The velocity of a fluid decreases as the cross sectional area of a pope increases True or false?
It's not likely that any property of fluids correlates
in any way with any Vatican situation.
If a pipe of X cross sectional area is connected so a fluid flows at a specific velocity, and then a pipe of 2X cross sectional area is connected to the pipe of X cross sectional area, the velocity of fluid flowing in the 2X pipe will be less than what is flowing in the X pipe. In this case, what you're saying is true.
What is the meaning of 'voltage drives current'?
Think of Voltage as the pressure and Amperage (current) as flow. If you think of it as pipes with water then the pressure would be voltage, and current would be how much water flows past a certain point in the pipe in a given time.
