Electrical Engineering

It depends on whether it is copper or aluminium, what its cross-sectional area is, and how it is to be installed. If you know all these things, then you can look it up in the tables provided in your country's wiring regulations. In the UK, this is BS 7671:2008 Requirements for Electrical Installations.

746 watts equals 1 HP.

the one and only the main difference b/n them is a dc motor takes the electrical energy as its input and gives mechanical energy as its output where as in the dc generator takes the mechanical energy as input and gives electrical energy as its out put

In both the case we can't get 100% efficiency because total input can't be converted into output.

If you are referring to domestic electrical outlets, most regions use either 110 - 120 volts or 230 - 240 volts.

If you are asking about an actual motor it is best to read the motor's rating plate.

If you are asking how to figure out the current in Amps drawn by a motor which produces a power output of 3 horsepower (hp) this question is way too vague to be answered accurately without knowing a lot more technical details.

The current drawn will depend on (a) the type of motor and (b) the Voltage that the motor is designed to run on. Regarding motor type, is it a Direct Current motor or, if it is an Alternating Current motor, is it a single-phase motor or a 3-phase motor. If it is a single-phase motor, then is it a squirrel-cage induction motor or a commutator motor of the type often used in vacuum cleaners or power tools? Another type of alternating current motor is the slip-ring synchronous motor but that type is not often used to supply only 3 horsepower.

A very rough way to calculate a possible current draw if you know the motor's operating voltage is to use the fact that 1 hp is approximately equal to 0.75 kiloWatts. So 3 hp = 3 x 0.75 = 2.25 kW.

Now, knowing that the actual efficiency of a motor depends entirely upon its design type, we shall have to assume an efficiency factor for the conversion of electrical power to mechanical power.

If we assume the motor is only 50% efficient then, to produce 3 hp, it will have to be supplied with electrical power of at least 2 x 2.25 = 4.5 kW.

Since Power P (Watts) = V (Volts) x I (Current in Amps), the current drawn I would therefore be given by I= P/V:

At 12 Volts DC: 4,500 / 12 = 375 Amps. (This would be a typical peak starting current drawn by, say, the starter motor of a small car engine in Summer. In Winter it might get to 500 Amps or more!)

At 120 Volts RMS AC: 4,500 / 120 = 37.5 Amps RMS single phase

At 240 Volts RMS AC: 4,500 / 240 = 18.75 Amps RMS single phase

UJT is the voltage controlled device.in which only one mejority carriers are responsible for current flowing. UJT is one junction transistor and it is three terminal emitter and two base.

BJT is the current controlled device. in which both mejority and minority carrier are responsiblefor current flowing. this type of transistor consists of two junction and three terminal these are : emitter , base , collector.

Yes. It will make your motor a little faster though, so it depends on what you are powering with this motor. IE Can the piece of eguipment be ran faster?

The fuse, because it is expected to fail first on any fault.

A pole slip occurs when a motor or generator cannot maintain synchronicity. This occurs because the field excitation is too low.

There will be at lease three and on some conduits additional information. There will be the manufacture's name, type of material the conduit is manufactured from and the diameter size of the conduit. For example Scepter PVC 100 mm (for American customers 4") conduit.

Generation, transmission, and distribution.

quasi means half then VSI and CSI combined to maintain unity power factor.

in a parallel circuit resistance decreases increasing the current.

YES IT IS. Any quantity which is ratio of two physical quantities having same unit is dimensionless. Dielectric constant is ratio of Permittivty of medium to the permittivity of free space. As Permittivity of medium and permittivity of free space both have same units(F/m ie Farad/meter) dielectric constant becomes dimensionless quantity

They will both last for the same amount of time. In both situations all of the battery's power is being used, but in parallel, you can separately control the individual loads that you put on the circuit with switches.

Hope that helps

Dielectrics is a fancy term for insulators, based on the material used and its efficiancy at a measured range of frequencies. For example, in a coaxial cable, the better it isolates the main frequency from feeding through to the shield, the higher the dielectric value.

The short answer: Cost effectiveness.

The long answer: Employing water as a hydraulic fluid is entirely possible for many applications, but produces several additional challenges which will dramatically and likely prohibitively raise the price of the apparatus. For most applications, the higher costs will represent an unmarketable product.

The issues include:

Viscosity: Water has a much lower viscosity and higher specific gravity than hydraulic oil. This results in at least 3 other issues. First, the piston and cylinder materials (usually steel) will erode much quicker due to the resulting higher velocity and more turbulent flow. Second, the use of special valves will be required to prevent the mechanical shock caused by abrupt fluid flow stoppage inherent to water. Third, the lower viscosity also means it will be more difficult to prevent leaks, requiring more stringently machined parts with much finer tolerances.

Bacteria: A closed water system can provide a breeding ground for all kinds of microorganisms. This can result in clogged lines, filters and a potentially unsafe/unhealthy condition in the event of a leak.

Corrosion: Oxygen in the water as well as sulfurous by-products from bacteria can potentially corrode component materials.

Temperature Range: Water freezes at 32 degrees Fahrenheit. If freezing occurs, and due to the non-compressible nature of ice, it will almost certainly damage or destroy hydraulic parts. Anti-freeze agents will need to be utilized at the cost of the inherent environmental and toxicity concerns of such substances.

Lubricity: Water's comparatively low lubricity will lead to increased contact friction and resulting wear of components.

All of these issues can be addressed and overcome, with the disadvantage of dramatically higher cost vs. hydraulic oil.

Use a voltage divider and an standard high input impedance voltmeter connected to the low voltage output tap of the divider. Just check that:

a) the voltage divider has enough resistance to minimize loading of the voltage source (The voltage divider resistance should be as high as possible).

b) the voltmeter's input impedance is at least 10-20 times larger than the output resistance (impedance) of the divider. If necessary add a high-input impedance amplifier or a transducer between the divider output and the voltmeter.

What is high voltage for you?

The voltage of the lights doesn't matter, the current draw does. Find the current draw of your circuit. Look up the resistance of the wire that you are using, either in the manufacturer's catalog or NEC chapter 9. Remember to figure twice the wiring run length, since you have two wires running out to the lights. The formula: E=I*R E(voltage) equals I(current) times R(wiring resistance) Example: 100 feet from breaker to end of lights, 12A total current draw, 12 AWG copper wire Resistance (from 2005 NEC chapter 9 table 8) = 2.01 ohms per 1000 feet. Total wiring resistance = (200feet / 1000feet) * 2.01ohms per 1Kfeet = 0.402 ohms E=I*R E=12A*0.402ohms E=4.824V The voltage drop to our lightswould be about 4.8V. They would see about 272V.

It's a Field Effect Transistor. I personally wouldn't consider it either of those options; if I had to pick one, it's more inductor-like (in that it has impedance).

Two.

Permanent magnet field motors. With a these motors, a permanent magnet is used to replace the field coil. DC power is connected via the brushes, to the armature only. Reversing the polarity, will cause the motor to reverse its direction of rotation. It is very common to use a switch to intentionally reverse to the polarity, to allow reversal of the motor if desired.