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Electrical Engineering

Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.

23,056 Questions

Does the average 2300 sq ft home in Phoenix use 3 Kw or 30 kw or 300 kws per day?

There are two measures of electricity to know about: kWh, and kW. kWh, or kilowatt-hours, is a measure of total energy use over time. It's like how far you've driven your car. kW, or kilowatts, is a measure of instantaneous consumption, like how fast you are driving at any given second.

The average home in Phoenix might max out at around 3 kW or a little more when everything - your computers, refrigerator, lights, air conditioning, etc. - are running. (An individual hair dryer might use 1.5 kW, so don't run those too long.) kW, however, is not how you get billed. Almost all residential properties get billed on kWh, the total amount of electricity they use each month. kWh can be calculated by multiplying kW by the number of hours you used that kW. This is the same as figuring out how far you've driven by multiplying your speed by how much time you spent driving at that speed.

In Phoenix, an average house your size might use around 30-40 kWh every day. It could be twice this in the summer when you're air conditioning, and much less in the fall or spring when you're not.

What is a ferrite suppression sleeve?

A ferrite suppression sleeve is a cylinder of ferrite with a hole in the middle through which a wire or cable is passed.

This device adds a "chunk" of inductance around the wire, and this results in the suppression of higher frequency signals. Power supply cables and other conductors that carry low frequency alternating current may have one of these sleeves installed. They are used to suppress high frequency interference and keep it from getting into or out of the equipment where they are installed. Use the link below to see some images and get a feel for what these are so you'll be able to spot them in the future.

What are possible risks of endolymphatic shunt treatment?

discomfort in the operated ear and the throat (from the breathing tube inserted during surgery), which can be controlled by such analgesic medications as meperidine

What are the advantages of automatic load sharing of transformers?

advantages for automatic load sharing of transformer with protective analysis

What is the abbreviation used to represent a unit of electrical current?

A

Answer

The SI unit for electric current is the ampere, whose symbol (not 'abbreviation') is A. The ampere is defined in terms of the resulting force between two current-carrying conductors, due to their magnetic fields.

Why doesn't the starting point for summing the voltages around a closed loopmake any difference?

-- If you do the sum around a closed loop, the items that are summed

are always the same items. Arithmetically, starting at a different point

is just a matter of lopping a few of them off the bottom of the list and

moving them to the top, before summing them.

-- The sum is always zero anyway, so it makes no difference where you

start or end.

How do you interface touch-pad module with PIC?

A touch pad screen and hardware sensor return the screen coordinates of where it has been touched.

Using the touch screen simply means that the software has been written in such a way as to make some kind of logical sense out of the coordinates.

Could you explain why connect gland steam area of HP turbine with reheat inlet line of IP TURBINE?

BECAUSE IF YOU DIDN'T TEMPERATURE AND PRESSURE DROPS WOULD ALREADY BE TOO BIG TO ALLOW 2 EXTRA STAGES OF TURBINES (IP AND LP'S). EVIDENTLY TO RE-CIRCULATE STEAM BACK TO BOILER AND ON TO IP TURBINE IS MORE COST-EFFECTIVE (I.E.: MAKES YOU GAIN MORE MONEY) THEN PERHAPS NOT BEING ABLE TO ADD ANOTHER 2 STAGES BUT ONLY ONE (I.E.: IP). THIS WAY YOU CAN MAKE SURE TO EXPLOIT ALL ENERGY OF THE STEAM FLOW. IF YOU DIDN'T REHEAT LOSSES WOULD BE GREATER THAN GAINS pleas be more clear in your answer and tll mw th benifet of the hp & lp glands

Is DC voltage and average voltage same?

no, dc volatage is a type of current direct current, ac is alternating current, average voltage could be any type of voltage ac or dc that maintains a constant range

Answer

No. A DC voltage is exactly equivalent to an AC rms-voltage. So, for example, 100 V (DC) is exactly equivalent to 100 V (AC rms). The average value of an AC waveform is zero.

What is the impedance for 110kV vacuum Circuit Breaker?

It should be something about 70 micro Ohm for VCB with two breaks per pole and about 30-40 micro Ohm for one break VCB

Why is it inductance does not affect current in a Direct Current circuit?

The Nature of InductanceAn inductor is, simply put, an electromagnet, the like of which many of us played with as children. A current through a wire is a flow of charges, and the movement of these charges generates a sort of 'wake' in spacetime, much like the wake of a ship on the ocean. We refer to this wake as a magnetic field, and the equation describing this is called Ampere's Law, which is one of Maxwell's Equations.

When an inductor is first activated (when current begins), the flow of charge begins to set up a magnetic field in and around the coil. Since a magnetic field is a real thing, a kind of distortion of spacetime, the act of creating a magnetic field requires energy, and the inductor harvests the energy of the electrons to accomplish this. As a result, the electrons slow, and the inductor can be said to 'resist changes in current' by harvesting and storing energy.

Naturally, there is a maximum magnetic field associated with any voltage, just as there is a maximum wake that can be generated by a ship moving at a given speed. When the inductor is 'fully magnetized,' when the magnetic field of the inductor is as large as the given current can possibly support, it stops harvesting energy from the circuit and simply holds on to the steady magnetic field that it has created. If the voltage should decrease, the magnetic field begins to collapse, depositing that energy back into the electrons, speeding them along. Thus, again, an inductor 'resists changes in current' by discharging energy.

In conclusion, inductors create magnetic fields for energy storage, and they have a maximum storage of energy for a given voltage. In a 'DC circuit,' the inductor has had sufficient time to build up it's storage of energy and no longer harvests energy from the stream of electrons. It is 'full.'

This also explains why the impedance of an inductor is said to be low at low frequencies, where the inductor has time to charge and discharge itself to keep up with the slowly changing voltages, and why that impedance is high at high frequencies, where the inductor is racing to keep up with the changes, constantly harvesting and spitting back energy.

How do you Store AC power?

ac power cant be stored

It is much easier to store DC power. Although you might be able to make a case of "stored AC power" - such as the turning mass of a generator - the kinetic energy of this turning mass is converted into AC current - When load suddenly increases, some of this stored kinetic energy is converted into extra electric energy, and the speed the mass is turning at will begin to decay. Before it decays too much (hopefully), the governor on the generator will increase mechanical energy to the spinning mass to keep the speed at the desired value. So in effect a (small?) amount of energy is being stored in the spinning mass, which is then converted to AC power.

What is the physical length of a voltage waveform?

Voltage does not have a waveform. The waveform is based upon the frequency of the voltage or current. A battery (any voltage) does not waveform, however the voltage coming into your house (US) has a frequency of 60 Hz. The length of the 60 hz waveform

Length (in centimeters) = (3 x (10 ** 10))/ Frequency in hz =

500 000 000 cm

What is alternating hemiplegia?

Alternating hemiplegia is a very rare condition characterized by recurrent episodes of temporary paralysis.

Why 250 ohm resistance using for transmitter calibration?

In this situation, to calibrate a transmitter you need a power circuit and communicator circuit. The Hart communicator used in the calibration process is connected to the power source circuit in parallel. The power source circuit is the one that has ammeter, 250 Ohm resistor, and power source all connected in series. As the transmitter sends output mA, it creates volt drop across the 250 Ohm resister. Let's say the volt drop across the resistor was 1 Volt.

Now, back to the Hart communicator. It is a load, meaning there will be a volt drop across the Hart communicator. Since it is in parallel with the power circuit, it is also parallel with the resistor. So, the 1 volt drop across the 250 Ohm resistor will also make 1 volt drop across the Hart communicator. Technically speaking, the 1 volt drop across the Hart communicator is only true if its resistor is also 250 Ohm. However, it does NOT matter what voltage drop is in the Hart communcator. It only sees the "relative" voltage drop changes to measure the changes in transmitter outputs.

What is the difference between filter and rectifier?

A rectifier is a device that contains diodes to convert an AC supply into DC. The resultant DC voltage has ripple on it at twice the source frequency, or six times the source frequency for a 3-phase rectifier. The subsequent filter is there to filter out the ripple to provide a constant dc voltage.

On power supplies the filter is often a series inductor, while on low-power supplies used in electronics the filter is a parallel capacitor. Additional components may be added to give extra pure DC is required.

Is the sum of the resistance in a parallel circuit always excessds the total resistance in a circuit?

Not sure what you mean. The equivalent (total) resistance in a parallel circuit is less than any individual resistance.

Why do high tension transmission wires carry electricity at high voltages?

For a given load, the higher the supply voltage, the lower the resulting load current. So, using high voltages reduce the load current which, in turn:

  • minimise voltage drop along the line (which, at low voltages, would otherwise be enormous, rendering transmission of energy impossible).
  • enable conductors of practical size.
  • reduce line losses.

What is an AC single phase 2 wire system?

two wires coming off the secondary of the transformer ex. residential voltage of 120 volts each line, and one neutral wire, L1 to neutral is 120 volts, L2 to neutral is 120 volts, L1 to L2 is 240 volts.

Answer

A single-phase, two-wire, system comprises a line conductor and a neutral conductor. In European countries, the line conductor for a residential supply is at a nominal potential of 230 V with respect to the neutral.

In North America, a 'split phase' system is used for residential supplies; this is a single-phase, three-wire, system comprising two line conductors which and a neutral conductor. The nominal potential difference between the line conductor is 240 V, while the potential of each line conductor with respect to the neutral is 120 V.

Can you run a 7.5 hp 3 phase motor on solar energy?

The output from solar panels is a d.c. voltage which, using an inverter, is converted into an a.c. single-phase voltage. So under normal conditions, the answer would be no.