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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
Why does the peak emission wavelength increase with temperature?
The band gap of the semiconductor decreases as the temp. increases,
and with formulae E = hv (which is inverse of the wavelength)
as a result wavelength increases.
reference: http://ecee.colorado.edu/~bart/book/eband5.htm
In order to feel 9V on your tongue, you need enough current, for enough time, for your brain to recognize the current.
Homemade capacitors tend to be rather low in capacitance. The resistance of your tongue might then discharge the capacitor rather quickly, and you might not notice the voltage before it goes to zero. Try this with a large capacitor, such as a few hundred microfarads and see what happens. Please do not charge the capacitor to more than 9V - you do not want to hurt yourself!
1.73, the square root of 3.
Motors are rated in horsepower, not KW.
How do you calculate effective resistance of an electronic curcuit?
its the same as normal resistance, so if you wanted to add the resistors when in parallel you would add them by 1/R1 +1/R2=. If they were in series you would simply add.
3415 BTU = 1 kva
The PDF uses kilowatt but they should be close enough...
When was the High Voltage Engineering Corp. founded?
The High Voltage Engineering Corp. was founded in 1946
Electrolytic capacitors cannot be used on an AC (alternating current) system.
Which powerful electrolytic capacitor or mylar capacitor?
- an electrolytic typically will have more capacitance than a mylar
- a mylar will typically have a higher breakdown/operational voltage than an electrolytic
Which were you looking for, or did you want something else?
Why clip-on meter show the 3 phase current is zero?
This question needs some more information. The obvious answer would be that there is no load, thus no work being done which equals no current. There is also the possibility that the clamp meter is across all three phases simultaneously (i.e. a multiconductor cable) which under the correct conditions might not show a cummulative current of zero (each current phase is 120 degrees out of phase. using vector math concludes a cummulative current of 0), or the conductor is shielded not allowing the measurement of the electrical fields. This assuming the clamp meter is measuring a self generated interference signal to measure the fluctuations in the electrical field of the conductor.
How do you increase AC voltage single phase from 180 v to 220 v?
Not sure how you got 180 v to begin with. If you're sure you have 180V, the only way to get to 220V is with a transformer. Grainger carries a wide variety and may be able to help you.
Home wiring usually involves two phases of electricity. When measured from neutral (the white wire) to hot (the black or red wire) a voltmeter will read about 120V. When measured between the two hots (black and red) a voltmeter will read 208V. On your cooktop, air conditioner and other high voltage items you'll see them connected using just the green (ground) and the two hots (red and black). The white wire is often used, but sometimes not, depending on the appliance.
What is Saturation voltage of bjt?
It is the CE (collector - emitter) voltage at a given collector current when the transistor is fully on. Increasing the base current will not lower the CE voltage any more once saturation has been reached.
Definition of strategy department?
Being attuned to market trends, the Management, Systems, Strategy Department places the emphasis on understanding the phenomenon of globalization, taking account of technological and organizational changes, the integration of new managerial practices, and application of the new strategic order
Does induction require objects to touch?
No induction does not generally require the objects to touch. Induction can mean that one object induces an electrical change in the other object from a distance
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You have a misfire - engine related, not tranny...get the engine checked/tuned up...etc... dave
How ceramic capacitors can do filtering in replacement of electrolytic capacitors?
Electrolytic capacitors do a very good job of bulk filtering, but they have poor high frequency performance due to distributed inductance. The ceramic capacitor has excellent high frequence response, and will often be used in parallel to the electrolytic to filter out fast rise time step changes in current demand.
What is the latest technology in circuit breaker?
The latest technology used in circuit breakers are Arc Fault Circuit Interrupters. They will shut off the circuit if the hot and neutral or two hots touch.
If the current increases what happens to resistance?
An increase in current will only affect resistance if it causes the temperature of the conductor to change. For pure metallic conductors, and increase in temperature will cause an increase in resistance.
4 How do you determine current in a parallel DC circuit?
The current in each individual component of the parallel circuit is equal to
(voltage across the combined group of parallel components) / (individual component's resistance).
The total current is the sum of the individual currents.
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Another approach is to first calculate the combined effective resistance of the group of parallel components.
-- take the reciprocal of each individual resistance
-- add all the reciprocals
-- the combined effective resistance is the reciprocal of the sum.
Then, the total current through the parallel circuit is
(voltage across the parallel circuit) / (combined effective resistance of the components).
Why Power factor becomes less lagging when capacitor is switched on?
Because capacitor withdraw leading current from source and net resultant become less lagging.
How can you rotate the stepper motor to different angles?
A; stepper motor can rotate to various angle if the resolution is infinite then the rotation will be infinite. however practically is set to step a certain angle per step
For what purpose do you short circuit the main and common terminal in a wattmeter?
A wattmeter has two coils: a current coil, which must be connected in series with a load, and a voltage coil, which must be connected in parallel with the supply voltage. Accordingly, a wattmeter has four terminals: two for each coil. One terminal of each coil needs to be connected to the line (as opposed to neutral) conductor and, so, these terminals are connected together. Having said that, this is not absolutely necessary, and the two coils can be connected quite separately. Basically, how the two coils are connected comes down to the configuration of the load whose power is being measured.
