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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

Will you get a electric shock when the negative terminal of the dc power supply is grounded and the positive terminal is held by us?

Only if we are also in contact, directly or indirectly, with ground.

By ohm's law, current is voltage divided by resistance. Conductance is the inverse of resistance, so current is voltage times conductance. No conductance - no current.

How much does air expand at 35000 degrees?

If you assume pressure stays the same (so volume is not limited in any way), you can use the ideal gas law, pV = nRT. I assume an initial condition of ~20C temperature (293K). Also, I assume the temperature you're giving is in degrees F. 35000F = 19427C. If the above assumptions are correct, air will expand 19427 / 293 = 66.3 times its' initial volume.

Is it possible to use a moving coil loudspeaker instead of a moving coil microphone?

Yes, but the sensitivity and frequency response will be very poor. The diaphragm on a microphone, corresponding to the voice coil and cone on a speaker, is extraordinarily light and compliant.

How do you calculate the watts of LED and energy saver lamp?

To calculate watts you need two of the three: Voltage (V), Current (A) and Resistance (ohm).

Power (Watts) = (V^2) / R = (I^2)R = VI

What is the line side of the 3 phase transformer?

The primary line side of a 3 phase transformer should be marked H1, H2, H3. The line side is the incoming voltage that you want to step up or step down or isolate.

Why must you observe personel protection and hygiene procedures at all times in the work place what are these procedures?

cause if the doctor didnt wear gloves when he was giving you the rubber glove treatment, hed get poo-ey fingernails

What is a solder sucker used for?

To remove melted solder, either as clean-up from a poor solder job, or in preparation for removing a component.

What is an ideal transformer Draw the no load phasor diagram of transformer?

Resistance ideal transformer is the one having no core losses, infinite permeability no mmf needed to set up flux), windings are having no resistances or reactances.

Can the voltage be adjusted on an HP laptop charger PPP017H 18.5v 6.5a power supply. To be used for a different application. I need to get the voltage down to 15 - 16 volts.?

18.5v should be fine for a 15-16v application. remember circuits will only draw the amount of current they need, no more. you could also try adding a current limiting resistor in series with the load. use a VOM for this testing (as the load).

What is the frequency of DC signal?

Zero = Nothing = Nil = 0 Hertz or Cycles per Second Direct Current is just as its name says: it does not alternate so it does not have any "frequency".

Why delta connections used in overhead transmission lines?

There are essentially 2 types of connections for a 3 phase AC transmission lines Star and Delta , Star is a 4 wire connection with each phase supplying potential with respect to a common ground wire , while delta is 3 wire connection with any single phase at one given time acting as a ground , for transmission reducing one wire makes a lot of cost difference hence it is favored

What phase includes maintaining the system performance capability relative to the threat the system faces?

In which phase are initial technology, engineering, integration, and life-cycle cost risk-reduction activities conducted?

What are circuit patterns?

Circuit patterns are the collections of transistors, capacitors, and associated components and their interconnections.

Why does my home AC charger charge my iPhone so much faster than my automobile DC charger?

Phone will charge faster with a larger charging current. Charging current depends on voltage, so your home charger likely has a higher voltage and therefore a higher charging current.

What is meaning oof rated values of current voltage power and torque of an electrical machine?

What it means is that those rated values may not be exceeded, they are the maximum that the machine can take.

How do you find RMS Error Between Two Signals?

I have two Different Signals, I would like to find the RMS Error Between them, and Mathematically derive how the signals differ from each other.

I would like to find the RMS Error for the two Signals. Please Help.

Thanks in Advance.

What is mean by Zero Voltage Switching?

turn on and turn off a device and act as a switch is called as zvs

How do you determine the terminals of integrated circuits LM 7808?

A: I could tell you but it is better if you learn how to do it on your own look up datasheetlocator.com LM78XX . For these numbers there are SOT-223 and TO-252 and TO-220. These numbers specify packaging You probably have TO-220 in that case looking from the top left is adj vout vin. The metal can be Vout again it depends on the packaging use a VOM to ascertain the metal tab connection.

Why during loading the voltage get decreased at output?

Output voltage (...of a transformer, for example...) will decrease as it is loaded because of the transformer's internal resistance. As output current increases/load resistance decreases, a larger voltage will be dropped across the internal transformer resistance.

This same phenomenon is present in AC and DC systems (such as batteries).

Does a 60947-3 switch have a breaking capacity?

All switches have a breaking capacity. The number 60947-3 is not a switch number it is an IEC standards publication that relates to panel mounted switches. The publication sets out specifications that manufacturers have to adhere to so as to get their equipment approved for use.

Can you use an ignition coil as primary transformer of Tesla coil?

yes,ignition coil can also be used to energise the Tesla coil very well ,because it is also a type of high voltage potential transformer and it can be used in manner of fly back configuration used this and I'm satisfied that it works same as other H.V t/f just there is need of little modification required to energise it and its output also i.e square wave to sinewave...

Can an alternator at 200rpm make 5kv electricity?

Emf (voltage) =2p phi N Z divided by 60c

p= no of pairs of poles

phi = flux

N =speed (rpm)

Z = can't remember

c = no. of parralel paths

if you can make the values of the other parts of the formula such that the result is 5 kv your on

this is initially a dc generator but can be made to apply to ac