Electrical Engineering

That is a wrong question, because the house has to take the voltage, the power station is delivering.

Either 120 volts in the USA or 230 volts in Europe.

Volts are never consumed.

we use grounded electrical circuit to prevent high voltage from any type of electrical source. with the help of grounded electrical circuit we by pass the high voltage to the ground. in common language we call it earthing.

It changes the tap while it is operation (hence "on load"). This allows real-time voltage regulation for the transformer secondary (as load picks up, causing the voltage to sag, the LTC can tap up, increasing the voltage).

Flux is used to bond soldered metals together. The flux is spread onto both pieces of metal that will be soldered. If the metal is a wire, spread the flux on the metal part of the wire. Then heat the solder and place the two pieces being soldered together with a tongs or the tip of the soldering iron.

EPROM (Electronic Programmable Read Only Memory) chips can be erased if it needs to be updated or fixed. It can be erased electronically only These are comparatively expensive than PROMs. PROM (Programmable Read Only Memory) chips are relatively once written and to rewrite them you need to replace entire data on it. These are relatively less costly.

PROM is the Programmable ROM that allows the user to store data. an instrument called a PROM programmer does the storing by 'burning in', once the data has been burned, the data cannot be erased!

On the other hand, an EPROM allows the data to be erased by the help of uv lights. i.e EPROM is uv light erasable and electrically reprogrammable.

Some commercial grills have the ability to be wired up single or three phase. Find the grille's nameplate and see if it can be done. This job is best done by an electrician as resistance coil ends have to be found and series or paralleled together depending on what the voltage is. I have done this once on an electric kiln and it took about an hour. To save you electrician costs have the manual of the grill ready so that the connection can be determined right away.

Magnetic levitation is the method used for maglev trains. In order to levitate a train, superconducting magnetic coils are used to completely expel the magnetic fields which will cause the trains to fly off its track.

They are similar only in that they both aim to reduce the friction that come from the vehicle moving over the water or rails. The means is quite different. The hovercraft uses a cushion of air and the maglev uses the repulsive force of a magnetic field.

Many can measure both - Vrms (AC) or DC voltage.

an electric current can produce a magnetic field. then,magnetic field within the core of wire will induced the voltage. so magnetic will produce from current at the galvanometer and magnet was far from galvanometer and it induces the voltage

A C program is basically a collection of functions that are supported by the C library.we can continuously add our own functions to C library.with the availibility of a large number of functions, the programming task becomes simple......

The abbreviation, 'r.m.s.', represents 'root mean square', which is a way in which a.c. current (and voltage) is measured so that it may be compared with a d.c. current that does the same amount of work.

A transformer's 'transformation ratio' applies, whether it is a step-up, or a step-down, transformer. It is normally expressed as its turns ratio, Ns/Np, where N = number of turns. For an ideal transformer, it can also be expressed as the voltage ratio, which is Vs/Vp (where p = primary, and s = secondary).

If you know what a capacitor is then a TFC refers to the way the capacitor is made. Boundary layers are separated by thin insulated film to provide compact multi-use capacitors for applications such as cell phones, avioniics etc.

Absolutely not! Glass, for example (every wine glass has a different natural frequency), can be broken by a frequency that matches its own but nearby objects aren't affected by the same frequency.

Diodes perform a different function as switches. switches allow you to control wether or ot electricity is flowing. diodes only allow power to flow in one direction. A light emitting diode may be used as an indicator for wether or not power is flowing through a circuit.

If you are looking for total load just add the loads together. If you are looking for sizing of a service to feed the loads, factoring is brought into the equation and it is governed by rules in the electrical code.

A voltage stabilizer is a device that stabilizes voltage. More often, it is called a line filter. It prevents transients (high voltage spikes, etc.) from making it through to the delicate equipment connected to it. A UPS (Uninterruptible Power Supply), on the other hand, provides power (for a short period of time - often 15 minutes) when the main power source goes down. This gives you a chance to do a proper shutdown, such as saving files and stopping the computer the correct way. (You should never "just turn off" a computer.) While a stabilizer/filter can actually persist the power, that persistence of usually only a half line cycle - 8 milliseconds - and that is not enough time to do a proper shutdown. A UPS usually also functions as a stabilizer/filter, protecting the equipment.

Yes a GFCI will work without a ground wire. A GFCI looks for a current differential between current in on the "hot" wire and current return on the neutral wire. Since current is the same throughout the circuit, no difference, no trip. If the load grounds out or shorts out, the current then takes the path of least resistance through the ground and not the neutral. This creates a difference between the "hot" and return neutral current and the device trips the circuit open.

Maglev stands for Magnetic Levitation (primarily used in trains) it refers to how they use the repulsion of electromagets to "fly" from 1cm - 10cm above an electromagnetic track (guideway) the applications are mainly for highspeed transport because as there is no friction, these trains have a record speed of 518km/h (311mph).

You can change DC to AC with a voltage inverter; sold at radio shack, or other electronic stores. Most dc motors are generally low voltage. The only inverters that I know of change 12 volts dc to 120v ac which is common to run house hold appliances off your car battery. You could then take the 120v ac and plug in a step down transformer to the voltage required by the motor. Hope this helps.

Common DC motors will not work on AC. This is because they contain permanent field magnets and are reversible by reversing the polarity of the applied current. Since AC reverses 60 times per second, the motor will try to follow the reversals, but will end up not turning at all, or perhaps buzzing a little bit. Also, it will overheat quickly in this state. It is easy to change an AC power source to DC by inserting a diode or rectifier in series with the motor and AC source, but the AC voltage must match the DC voltage rating of the motor fairly closely. A transformer may be needed ahead of the rectifier to reduce the voltage if house current is to be used. The diode used must be rated to handle the maximum voltage and peak current expected. (This will depend on the motor load.) Also, the motor brushes may develop high voltage spikes that can damage the rectifier, so it is a good idea to add a capacitor across the motor to absorb these. There is a type of motor called a universal motor or an AC/DC motor that will run on AC or DC (usually the DC voltage required is lower than the AC required). These motors have no permanent magnets, using instead an electromagnetic field coil. The reason these work on AC is because the field coil polarity reverses along with the armature coil when the AC source reverses, keeping the attraction between the two coils in the same direction. Most portable power tools and vacuum cleaners contain these motors, although they aren't intended to ever run on DC. They are popular for tool applications because universal motors also happen to be very powerful for their size and weight. A typical 115 volt universal motor will run just as well on about 30 volts DC.

DC generators are always useful in case of power outages. Many commercial companies use generators as back up units. DC generators are also energy efficient.

A transformer is a device that steps up, or steps down voltage. During this process current is also stepped up or down:however, voltage and current are inversely proportional ( meaning an increase in voltage results in a decrease in current and vice versa ) As an example: A step up transformer of 10:1 ratio with 12 volts and 10 amper of current applied to the primary will have ten times the voltage ( 120 volts ) and ten times less current ( 1 amrere ) at the secondary...and a step down transformer with the same turns ratio with 120 volts and 1 ampere applied to the primary will have 12 volts and ten ampere available at the secondary. The electricity supplied into homes and business uses wires carrying very high voltage and low current over long distances, then uses step down transformers to step down the voltage and step up the current.

However, in power engineering and protective relaying applications, there are what are called "instrument transformers" which have the specific purpose of providing information to devices (such as relays or meters) about the voltages or currents in the power system. Therefore, there are some differences in construction and connectivity between a Current Transformer (CT) and a Voltage (or Potential) Transformer (PT).

A CT will typically have a toroidal core and evenly distributed secondary windings so as to minimize leakage reactance. The primary is typically the main power line conductor, which passes directly through the toroidal core. This type of transformer is specifically for the purpose of measuring current values, and the secondary windings cannot be left open-circuited, or a large voltage will be produce, resulting in dielectric failure (and often an explosion). If a device is not connected to the CT, its secondary must be short-circuited.

A PT is connected between the main conductor and ground and can be either wound in the normal way, or the voltage can be taken from a subsection of a string of capacitors (this is called a Capacitive Voltage Tansformer or CVT, and is usually cheaper than the wound type, but is typically not as accurate). This type of transformer measures voltage values, and the secondary winding cannot be short-circuited, as this will produce excessively high currents, resulting in the failure of the PT or the wires it is connected to. A PT can be left open-circuited.