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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 ground fault circuit interrupter is the device used to de-energize the circuit.
What would happen if one bulb burns out in a parallel circuit?
Nothing much will happen except the same bulb will not blow..
A: A DELTA transformer is a 1:1 voltage transfer delta to Y IS 1:2 voltage transfer. That is for 3 phase system, If the phases are not exactly matched or the voltage is not exactly right then on a Y setup there will be circulating current at the common node.
Does voltage regulator increase or decrease the current input?
A DC voltage regulator gives a constant output voltage provided the input voltage is at least 1.5 v higher, up to a given limit. The input current is slightly more than the load current, because a small amoutn of current is needed for the voltage regulator circuit. Check the datasheet of the component which you are using to find the limits. 7805 IC can give upto 1A of current if there is adequete heatsinking.
Where sf6 gas is filling in sf6 braker?
Usually in a sealed tank, the switch contacts are in the tank too. The SF6 gas quenches any arcs that form when the switch contacts are opened.
Why current lead voltage in coil?
because a coil is an inductor,for current leads voltage in an inductor
AnswerIt doesn't! Current lags voltage in a coil. In a purely-inductive circuit, the current lags the supply voltage by 90 degrees. The reason for this is 'self inductance'. Whenever a current changes, a voltage is induced into the coil which opposes that change in current. The maximum self-induced voltage occurs when the rate of change in current is greatest. The greatest positive rate of change of a.c. current occurs when that current is passing through the zero axis of its waveform, so the greatest (negative) induced voltage occurs at thatsame point, which is one-quarter of the wavelength, or 90 degrees. In accordance with Kirchhoff's Voltage Law, the supply voltage must be in antiphase with the induced voltage. So when the peak induced voltage is negative, the peak applied voltage must be positive. Or, to put it another way, the peak value of the applied voltage must occur 90 degrees before the peak value of the current -so the current lags the applied voltage by 90 degrees.
Is 12 volt DC a modified sine wave?
Not really. DC is not a sine wave at all. It is a flat line, in terms of time.
On the other hand, if the DC is coming from a power supply that is rectifying AC and filtering it, but not regulating it, then under load conditions, it will exhibit a semi triangular waveform. It will increase when the input AC rises above the diode forward bias point and then it will follow the input AC. It will decrease linearly when the input AC reaches is peak and then starts back down, with a slope proportional to the load. As such, it is a periodic waveform, and by Fourier analysis, it is then a sum of various sine waves. Even if you don't want to get "technical" by looking at Fourier, you can still compare the semi triangular waveform with the input AC waveform, and see that they "fit together".
So, yes, 12 volt DC from a power supply is a modified sine wave, unless, of course, there is a regulator stage in the power supply - in that case, it should be flat, as stated first, above.
Which is better power surge protector or automatic voltage regulator?
The main caused of component failure especially electronic part is power surging or spikes to best protect the parts is to install a good power surge protector.
What are the three main characteristics of circuit training?
Different activities
you can do it in any space
Can be done at different intensities
What are the differences between regular lights and LED lights?
Regular lights (assuming you are referring to automotive applications here) are "incandescent" bulbs which have the following features...
Create light by "trying" to burn out the filament (no oxygen inside the bulb prevents the burnout from happening).
Get very hot (see burnout above).
Use lots of electricity for the amount of light produced.
are fragile (weakened by physical shock and vibration).
Inexpensive to replace.
Burn out (always).
LED (stands for Light Emitting Diode) lights have the following features... Low power consumption (consumes milli-amps instead of amps) for the amount of light produced. Runs cool to the touch, even if on for a very long time. Virtually impervious to physical shock and vibration (is a solid-state device) Much, much more expensive than regular bulbs and usually require replacement of entire lamp assembly if they fail.
Generally last much much longer than regular bulbs, they get dimmer with age instead of outright burning out. Will not tolerate a voltage spike (such as can come from jump starting vehicle or failure of a voltage regulator while lights on or even from arc welding directly on the vehicle) and can fail outright if exposed to one.
Hope this helps.
Where is the wiper circuit breaker on a 1989 Jeep Wrangler 4.2L?
It's located in the fuse box under the steering column- The wiper fuse is on the bottom center of fuse box. The fuse is silver made of aluminum and oblong 1/2" long. It's a dealer item only! The above answer is spot on for Jeep Cherokees too. The front wipers on my 1989 Jeep Cherokee Laredo completely stopped working the other day. I just replaced the 4.8 amp aluminum "circuit breaker" (Owners Manual page 109, item # 15) with one of the three I got from a parts yard (very inexpensive) yesterday. All three work perfectly and the wipers are back in action (with the two spares now stored in a zip lock bag in the center console, along with replacement fuses, bulbs and the owners manual).
What is the current value of a 1993 Chevy Suburban?
"http://wiki.answers.com/Q/What_is_the_current_value_of_a_1993_chevy_suburban"
Why there are not pneumatic engines above 100kw?
pneumatic system use air and air has its limitation of use mainly due to its high compressibility as gas.high power applications may compress air to such an extent leading to destruction of the system.whereas hydraulics also have compressibility which is at an unnoticed level even at high pressure.
I meant motors or generators that run on air released from a reservoir of compressed air.
Can you use Auxiliary contact with circuit breaker?
You need to be more specific. Do you want a contact telling you if a circuit breaker is on? If that is your question, the answer depends on the model of the breaker.
Why when you plug any laptop chargers in the house all the electrics trip?
This shouldn't occur. If only one laptop charger is causing the problem, there may be a short in this charger. If you have tried multiple chargers, I suggest looking at the laptop and seeing if it is the cause.
"All of the electronics" on one breaker should trip if there is a short in the laptop or charger. The whole house (main breaker at the top of the electric box, usually) should not trip. If this is occurring, you may have a problem with the particular breaker to the plug you are using as well. If this is occurring, I suggest calling an electrician unless you know what you're doing.
Radio Shacks 25 ohm rheostat works very well to the point where on the slow end, you have to give it a kick start if you turn on the power when it is on that side. If it is already running, it will continue to run (no load) at the low end.
Will an ac unit run on modified sine wave?
The unit should run OK on a modified sine wave since motors are not that sensitive to the waveform. Efficiency might be slightly reduced.
The real problem may be in starting the unit. If the input does not have enough power to allow the compressor to start properly and it stays running on the start winding, it could burn up the start winding. Checking the current input with a clamp-on style amp-meter should show if it is drawing excess current by running on the start winding.
How do you work inductor in furnes?
As magnetic field is changed sinusoidally the Foucault currents induced in the metallic body heats the body and melts it. This is the principle of induction furnace
What wire to use for 4100r9w plug 250v 3p4w?
This plug is a pin and sleeve 250 volt three phase four wire device. It is rated at 100 amps. A #3 copper conductor with an insulation factor of 90 degrees C is rated at 130 amps.
How capacitor cancels inductive effect?
A capacitor try to leads the current while a inductor tries to legs the current so they cancels each other's effect ....
