Electrical Engineering

When someone says "drop me a line," they are inviting you to get in touch or communicate with them, usually through a quick message or note. A good response could be, "Sure, I’ll reach out soon!" or "Absolutely, I’ll drop you a line later." This shows you're open to connecting and acknowledges their request.

Maglev means magnetic levitation. So the train is not touching the track, in fact once the engines are fired up, the entire train lifts about one cm off the track. So ice is irrelevant to a maglev vehicle.

Unlike conventional vehicles which use friction as a braking force, e.g., tires on a road, a maglev uses eddy currents produced in the track as a result of magnetic force as both propulsion and braking methods.

It is the rated test voltage that will not cause insulation breakdown.

ac transient analysis is frequency domain analysis.

It's a resistor that changes values based on the temperature.

Resulting Powers derive from the mass of delegated powers or from a group of them. They are an extension of implied powers.

AC voltage with no DC offset will change both it's voltage level (constant change, hence AC) and polarity (ie direction) every 1/2 cycle when it crosses zero.

Inductors in series add up, so 15 mH

Resistors in A.C circuits completely, absolutely and totally follow ohms law. Ohm's law is followed by resistances and has nothing to with the alternating or direct nature of current.

Ohm's law is however not followed by non linear loads. Also, in A.C systems we generally write V=I*Z which is analogous to V=I*R in D.C circuits. For capacitive and inductive circuits the current magnitude varies in accordance with the circuit impedance but there is a phase shift corresponding to the lagging/ leading nature of current.

Conclusion: it's absolutely wrong to say that ohm's law is not followed in A.C. Its as much applicable to AC systems as to DC systems.

it means the rms value of 11 kv that vacuum C.B. can withstand it during 1 minute

First of all, the colours red, yellow, and blue, are applied to LINES not to phases!

To determine which line is which, you must compare them with lines that are identified. This process is known as 'phasing out', and is difficult to explain without using a diagram. I suggest you check out 'phasing out' on the internet.

Frictional , rotating losses are not common to transformers and rotating machines. these are specific to rotating machines.

Variable resistance.

It's because the voltage is a specified value, and the current drawn has a limiting value. So multiplying those together gives the VA or kVA that it can supply.

Amperes is not constant like voltage. You can have .01 amps or 1200amps on a wire. Basic sizes of cable and their amp limits (for residential usage): 14ga. 15amps, 12ga. 20amps, 10ga 30 amps. It doesn't matter if its on 110V or 220V

No. In a "regular" DC motor, the permanent magnets form the stator, and the brushes and commutator are used to get the DC to the rotor windings. In a brushless DC motor, the magnet is the rotor, and the stator is a group of coils arranged in a circle to form the stator. The electronic controller drives the individual coils in the stator. There isn't a good way to drive them without an electronic controller. A link is provided to the Wikipedia article on the brushless DC motor (BLDC). At least surf on over and check out the pics. The ones showing motors that have been taken apart are particularly helpful.

DC (direct current).

A: Some material have the property of a capacitor and this property can be varied by outside forces making it a transducer

Vacuum induction melting (VIM) is a metal process to use electromagnetic induction heating principle to melt the metal under vacuum conditions. In the electromagnetic induction heating process, the induction coil of induction heater will produce eddy current in order to melt the metal. This induction melting process can be used to refine high purity metals and alloys. If you want to learn more, please Visit gslipai. com or sent an email to lipaiheating@gmail.com.

A UPQC has the same structure as a UPFC. It can inject current in shunt and voltage in series simultaneously in a dual control mode. Therefore it can perform both the functions of load compensation and voltage control at the same time.

The UPQC must also inject unbalanced and distorted voltages and currents and hence its operating characteristics are than that of a UPFC.

Furthermore their operation philosophy is different. The UPQC is also an (PQ) enhancement device. UPFC and can operate under non-balanced conditions, whereas the UPFC is assumed to operate under balanced sinusoidal conditions.

Source: A. Ghosh, G. Ledwich - Power Qualtiy Enhancement using custom power devices (found at google: E-books)

Power = voltage times current

7.2 volts * 24 amperes = 172.8 watts

The sinusoidal signal is called a basic signal because, by Fourier Analysis, you can not further reduce it. It is one sine wave of one frequency of one amplitude of one phase. It has no harmonics. If you converted it from time domain to frequency domain you would only get one line, at the fundamental frequency.

Star and delta connection

If you are talking about a European residential supply, then the answer is yes -although you are using incorrect terminology. The correct term is 'line', not 'phase'. However, it is probably against the wiring regulations in your part of the world to wire a lamp between line and earth -however, this is often done, for test purposes, by electricians to confirm whether a line conductor is energised .