Electrical Engineering

It depends on the nature of the transmission line mostly under a fault it is the inductance that will be limiting the fault current so your power factor would be quite low. The exact number would change from line to line.

During a fault (say three phase fault for simplicity), the power factor will drop to the line angle (assume no, or very little fault resistance). On EHV systems, this is in the 80 - 88 degree range (typically). On VHV, it is often in the 70-80 degree range. A line angle of 90 degrees is a pf of 0, so to convert between this line angle and power factor: pf = cos (line angle).

As voltage gets lower, the assumption of no fault resistance becomes less valid, and the line angle becomes less (increased power factor).

The lowest VHV line angle I've seen is in the 60-70 degree range. I've seen 40-60 on HV, and as low as 30 degrees (.86 pf) on underground cabling.

A: Because both item are connected is series. Any resistance connected in series will carry the same current no matter of the resistance value or the number of resistors. However for an incandescence lamp the value will change when turn on and change when it is hot, That is because lamps have different property then resistance when cold and hot

11-15v from batt.

Characteristics of the lag phase include acute inflammation and the initial appearance and infiltration of neutrophils. Neutrophils protect the host from microorganisms and infection.

30 ohms.

Well, first of all, voltage is not carried. Voltage is the 'pressure' between the ends of

a circuit that makes charges want to flow. The charge carriers that actually do the

physical flowing are the electrons, with their negative charges. When they flow, we

say that there is 'current' in the conductor.

Both. That way a lot of power can be transmitted. The largest UK grid circuits work at 400 kV and a line of pylons can transmit up to 6000 MVA.

Insulation of a wire is tested with a megger. On the whole megger testing is non destructive. What happens is a DC voltage is applied to the device or winding under test. It is an insulation test to see is the insulation has been injured in any way to cause a short circuit when normal power is applied to it. On my megger there are 3 ranges 300V, 750V, and 1000 volts. Applying the proper voltage is essential to not damaging the device you are testing. Working voltages up to 240 volts should use the 300 range. Working voltages up to 600 volts use the 750 volt range and working voltages above 600 use the 1000 volt range. As you can see if you used the 1000 volt range on a device that had a working voltage of say 24 volts you could damage the insulation just by testing it. So meggering a device is non destructive if you use the tester as its instructions tell you to.

Insulated or double or triple glazing can achieve a high level of insulation of windows. This involves thick sheets of glass layered together to lower the transfer of heat.

I used Castrol 10w 40 , I think its whats recommended in the owners manual.

they come about when to night was dark

Because it stands for micron university.

The three types of maglev trains are EDS (electrodynamic suspension), EMS (electromagnetic suspension) and stabilized permanent magnet suspension (SPM).

* For EMS, same pole electromagnets in the train repel it away from a magnetically conductive track. * The EDS uses electromagnets on both the track and the train, to push the train away from the track. * SPM uses opposite arrays of permanent magnets to magnetically levitate the train above the track. http://trains.suite101.com/article.cfm/maglev_trains

The earliest known interactive electronic game was by Thomas T. Goldsmith Jr. and Estle Ray Mann on a cathode ray tube. The patent was filed on January 25, 1947 and issued on December 14, 1948. The game was a missile simulator inspired by radar displays from World War II. It used analog circuitry, not digital, to control the CRT beam and position a dot on the screen. Screen overlays were used for targets since graphics could not be drawn at the time

For connection plates = 10-15 Nm

To compan

One of the customers of a material engineer is an electrical engineer. To understand the customer and what he wants, a good material engineer needs to learn the basics of how to communicate with the customer. Engineers communicate through drawings so that means a material engineer needs to learn how to read/create electrical drawings.

A TRIAC is a solid state device that turns on at a specified phase angle in the AC wave form and then turns off at the next zero-crossing. It also works backward, in that you can turn it on on the negative going phase with a negative going pulse on the gate. By varying the phase angle of the turn-on point, you can provide varying voltages, ranging from full line voltage to a small fraction of the line voltage. By varying the voltage to a motor, you can thus vary the power, optimizing it for power factor and/or speed.

Often there is another TRIAC, one with two terminals, called a DIAC, in series with the gate of the TRIAC. This allows you to balance the firing points, with the effect of balancing the phase voltages for both the plus and the minus side. This reduces DC bias on the line.

electrical engineering

Class 322 (Single generators system)

Yes, voltage matters when charging a capacitor.

Capacitor charge rate is proportional to current and inversely proportional to capacitance.

dv/dt = i/c

So, voltage matters in terms of charge rate, if you are simply using a resistor to limit the current flow, because a larger voltage will attempt to charge faster, and sometimes there is a limit on the current through a capacitor.

There is also a limit on voltage across a capacitor, so a larger voltage could potentially damage the capacitor.

Batteries provide a voltage difference.

It is a speciality in electrical engineering dealing with higher voltage applications such as employed in electrical transmission, switch yards and any applications requiring extraordinary power requirements. It is involved with such things as wire insulation, special designs to avoid arcing, power line towers and so forth.