Electrical Engineering

the process of turning off of a thyrisror is known as commutation

usually yes. what is it being used for?

It's not the voltage that determine the size of the conductor,it's the current.

The rule of thumb is: 6A for every 1mm sq

"I" represents the current which is the flow of electric charge. Impedance is the measure of the opposition to the flow of current at a given voltage usually in a.c. circuits.

Take it to a qualified auto technician to repair. You can accidentally set off a $800 airbag messing with these circuits if you don't know what you're doing.

To keep you nice and cool, or used in electrical appliances to cool them.

Circulate air in a room.

Some RFID tags emit electromagnetic radiation, which, unlike ionizing radiation (think nuclear bombs), is not deadly (or at least we think its not--the debate about cell phones and brain cancer rages on). However, some RFID tags only emit a signal when they are electromagnetically "stimuated" by an external source. Usually the source is some sort of electromagnet which, through induction, "powers up" the tag and allows it to send the required data.

The transistor is a "single direction current flow" device. Typically, for an NPN device, the collector must be more positive than the emitter for the device to bias on. You could use the transistor in an AC circult, but it would only conduct on half the cycle.

Bipolar transistor current gain is also called "Beta," or the h-parameter "hfe."

beta = current_out / current_in

The beta of a BJT is mostly determined by the thickness of the Base region, and by the excess doping in the Emitter relative to the Base. A thin Base and a heavily-doped Emitter leads to a high value for current gain.

In a BJT, beta = Ic / Ib In a FET, beta is usually taken as infinity, since no current flows in or out of the gate. Beta is an impirical number. It means nothing unless the Ic is known or the load. It can have a beta from 1000 to 10 it all depends on the load.

It depends on the car, your usage, and what you mean by "green". I had a professor that often used the phrase, "You can't have your cake and eat it, too". If what you want is to minimize your impact on the environment, then you need to minimize you (...make sacrifices); Buying a product doesn't do this, your actions do. Walking would be more green. If that is not feasible, use a bike. If that's not feasible, public transport. If that's not feasible, perhaps you can carpool. If that's not feasible, maybe a "green" car would help. Just remember that batteries are made from some fairly toxic substances, and in general only last about five years. The used ones have to go somewhere, and that somewhere is back into the environment.

you need to be logged on to xbox live to put downloads. The downloads are soundwave, Jetfirie, Sunstorm, Jazz, aerialbot and sideswipe.

Heat=i^2*R*t=10*60=600 joules

Building Management System- in electrical terms this is information from the BMS outputs of a control can be made available to a computer in an office elsewhere for monitoring purposes

"Magnitude" means how strong it is - how much voltage (how many volts), or how much current (how many amperes).

If the motor wire numbers are L1, L2 and L3, it is not a single phase motor. It is a three phase motor. Also for future reference, a 220 volt single phase motor does not use a neutral.

What do you mean by a 'parallel delta' circuit -is there such a connection.

For the same bulb, there would be no difference if the AVERAGE power is the same. For DC this is easy....Power = V X I. For AC it is much more complicated, for a purely resistive light bulb, Power = Vrms X I. So for AC the voltage is the "root mean square" of the peaks.

Normally through the resistor's internal construction. It flows through any part of the resistor that has low resistance- be it anywere. And then there's this. It might be that one should consider that current flows through a resistor and voltage is dropped across a resistor. Perhaps this is where the question began. The former is fairly straight forward. The latter can be vexing. Voltage is said to be dropped across a resistor when current is flowing through it. The voltage drop may be also considered as the voltage measureable across that resistor or the voltage "felt" by that resistor. It's as if that resistor was in a circuit by itself and hooked up to a battery of that equivalent voltage.

Of the three conductors the combination is irrelevant except with respect to phasing and rotation. If the equipment requires proper phasing ( motors need to turn a specific direction), wire it up and "bump" a contactor. If the direction of rotation is not correct, swap 2 of the conductors. Do the swap at the lineside of the disconnect/ breaker, etc. In the case of an HVAC/R non-scroll compressor, rotation is not an issue. One exception would be if the control system were to use one phase to neutral. This should not be the case as you specified 4 wire three phase, which implies the fourth conductor by code, is a ground and control is provided by two of the three conductors providing control voltage. Check the schematic and/ or contact the manufacturer of the equip. lc

From the formula, E = V/d, where V is the voltage and d is the distance, it can be seen that the electric field and the distance are inversely related. Thus, as the distance between the parallel plate capacitors is reduced to half, the electric field is increased twice. Moreover, is a dielectric constant k is introduced, the capacitance will increase. This direct relationship can be seen in the formula, C = [k(Єo)A]/d, where k is the dielectric constant. The lowest possible value of k is 1; and that is when the dielectric is a vacuum. Other dielectric constants are greater than 1, such as teflon which has a dielectric value of 2.1 As the capacitance increases, the electric field also increases. (E = 1/2(CV^2))