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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
A generator producing 1 MW will sell how many units of electricity?
1 MW is 1000 kilowatts, so in 1 Hour it will sell 1000 units (taking a unit as 1 kilowatt hour)
How output voltage is out of phase in CE?
It should be ~180 degrees out of phase, because a CE amplifier is an inverter.
A BJT CE amplifier is a good example to look at. The output is across CE, and at a minimum total output voltage is split across CE and some resistor R. As a higher voltage is applied to the base, the current flow through CE increases as a result of the resistance of CE decreasing.
This boils down to a simple voltage divider at the output, Vout = CE / (R + CE). As CE decreases as a result of the input increasing, Vout will decrease.
if the bus-bars are used as the neutral or ground, then 0v would return. nothing will happen except for less room for connections
What voltage difference is there between or in a 380 volt 5 wire system?
5 wire systems are usually 2 phase with neutral
ive seen 240 to ground and 575 to ground
575v is used to get the most out of 600V wiring devices
next step in power is called switchgear 4100v
240V gives 480V between the 180deg phases and
340V between the 90 deg phases
quite a few paper mills use 2 phase
now if the is the question your asking
the 90 degree phase difference has sqrt(2) multiplier
the 180 degree has 2 multiplier
What is the use of a motor starter?
A motor starter is a specialized relay designed to control the main power to an electric motor, typically in an industrial setting such as on a large air compressor. Large electric motors demand more current that a typical off/on switch could be rated for and safely used with. A starter allows for a small switch, either manual or automatic, to control the motor by switching a smaller voltage than the motor itself uses. This has several advantages. It also typically contains overload/overheat protection for the motor being controlled.
What are the applications of Speech Synthesis in real life?
For mute people: Telephone communication possible by typing what they want to say into computer and having Computers speak to party on the other line. Speech synthesis is the artificial production of human speech. In addition to the above-mentioned usage, one of the main purposes of speech synthesis is to help people with visual impairments or reading disabilities to listen to written works on a their computer.
If you have a bad compressor does that mean you need a new contactor?
Not always. But if a compressor goes bad it can take out the contactor. I have replaced compressors before and found the contactor is still ok. In a commercial application Copeland will not honor the warranty if the contactor is not replaced at the same time a new compressor is installed. Not sure about residential but for a $15 contactor I would not gamble with it.
What is the danger of a 120v socket with reversed polarity?
The danger of a 120V socket with reversed polarity is that some appliances are designed to minimized the chance of a user coming into contact with the hot terminal of the line. This is done by polarizing the plug, making one blade wider than the other, the narrow blade being hot. In a lamp fixture, for instance, the hot side would connect to the center pin, while the neutral side would connect to the shell. The user reaching in to unscrew or screw in the bulb might touch the shell, but if that is neutral and not hot, the risk is minimized.
Another example of reversed polarity is reversed neutral and ground, which is dangerous because the ground conductor is not insulated and is therefore not rated to carry operating current.
Even more dangerous, is reversed hot and ground, which would electrify the frame of an appliance, creating an electrocution hazard.
Any electrician making one of these types of wiring errors should go to jail, and at minimum, should lose their license. Any non-electrician making one of these types of wiring errors may have to learn to hard way, such as by killing someone, that things electrical are best left to licensed electricians. By the way, in most US jurisdictions, if a wiring error causes a fire, the fire marshal will report that to the insurance company and the insurance company will revoke the fire insurance on the dwelling - that should make anyone stop and think about what they are doing.
Why current limit for programmable logic controller is 4-20ma?
4-20ma is an industry standard for signalling in a process monitoring and control environment. 4ma is one end of the range. 20ma is the other. If the receiver sensed 0ma, it would conclude that the circuit is open, and raise an appropriate alarm.
Single phase to three phase conveter for driving three phase motor using single phase?
This inverter is the cheapest and always available from famous vendors like ROCKWELL ,ABB, SIEMENS ,SCHNEIDER ELECTRIC....etc .
How do you check to see if the octane adjust circuit is open?
First you locate the connector. On my 94 ford explorer it is behind the air breather. It is a two wire connector that doesnt really connect to anything.
It may have a shorting bar installed in the plug or it might have been removed. If removed (pins not shorted together) this simply retards the timing 3 degrees to eliminate any engine pinging. Mine was removed before I bought it and have been driving without it for years...
Hope this answer has been of some help...
KB
How do you get a clutch line of a a 97 s10 transmission?
if youre askin to get it off; the line has a quick connect on it (kinda like on an air compressor) at the slave cylinder. if you look carefully, it has a plastic ring on the line, inside the connecter. push in the ring evenly on both sides, and kinda jiggle the line in an in and out motion. the line should pop off. when it comes off, none of the fluid will come out, therefore you should not have to bleed the line when you reconnect it. to reconnect it, just simply push it back in.
What is the voltage drop of a 240V 40 aluminum cable at 600 feet?
not enough information use a voltage drop calculator >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Use these two calculaters....... http://www.csgnetwork.com/voltagedropcalc.html or http://www.elec-toolbox.com/calculators/voltdrop.htm Good luck. Brian...
Manipulate the following equation, to make I the subject: P = I2R, where P = power, I =current, and R = resistance.
Can TVs diode can be connected in series to increase the surge current?
No. By Kirchoff's Current Law, components in series all see the same current.
Does a knot in a wire affect an electrical circuit?
The knot adds extra resistance and inductance to the wire, which in most cases will not make a difference to its performance in a normal circuit operating at dc or power supply frequencies.
To answer this question, you need not only Ohm's law, but also Kirchoff's current and voltage Laws.
Kirchoff's current law say the current at every point in a series circuit is the same. Lets call that current i.
Ohm's law say voltage is resistance times current. That means the voltage across each resistor R1 and R2 is V1 = R1i and V2 = R2i.
Kirchoff's voltage law says that the signed voltage drops around a series circuit add op to zero. This means that the voltages V1 and V2 must add up to be be equal to 12. This means that R1i + R2i = 12. This means that i = 12/(R1 + R2). But, hey, you say, this is just Ohm's law! This means that the current through the circuit is 2A. It also means that the resistance of two resistors in series is simply the sum of their resistance.
Now that we know the current, we can calculate each resistor's voltage. V1 = R1i = (2)(2) = 4, and V2 = R2i = (4)(2) = 8. Crosscheck 4 + 8 = 12, so the two voltages do add up to twelve volts, as expected.
In summary: The current through both resistors is 2A. The voltage across the 2 ohm resistor is 4V. The voltage across the 4 ohm resistor s 8V.
What is more powerful for a vacuum cleaner motor a 12 amp motor or a 110 watt motor?
A 110 watt motor is equal to a 1 amp motor... Versus a 12 amp motor, the 12 is more powerful. You've probably confused 110 watts with volts, as a 1 amp motor could not be used in a vacuum (it's too small).
Basically the amount of power is dependant on the amps the motor uses. You only have the spec on 1 motor so we can't answer your question. All vacuum motors are 110 volt.
You are trying to compare Apples and Oranges.
Amps or Amperage is a measure of electrical current.
Watts is a measure of electrical power.
When dealing with single phase power, which is most common in residences, the two are related by the following formula:
Watts (W) = Volts (V) x Amps (A)
Further we can be certain that the voltage is 120V since we are talking about a vacuum cleaner that would plug into a standard 120V household outlet.
A motor drawing 12 amps at 120V will produce 1440W under ideal conditions.
You can now compare apples to apples. 1440W vs 110W, however all this tells you is that 12amp device generates more power.
It dose not conclude that it provides more suction. For this you need to consider the efficiency (eff) of the devices.
1440W x eff = suction power
110W x eff = suction power
How does the number of bulbs affect the amount of electrisaty in a circuit?
Adding additional lamps has no effect on the supply voltage supplied to you home. If the lamps are connected in series, then the sum of voltage-drops appearing across each lamp will equal the supply voltage. If the lamps are connected in parallel, then the voltage across each lamp will equal the supply voltage.
