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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
R = r*L/A
where:
R = resistance
r = material resistivity
L = length
A = area
Since you are doubling the diameter, you are increasing the area by a factor of 4, so Y will have 1/4 the resistance of X.
An insulator is a material that does not conduct electricity. More specifically, it is a material that is chosen to prevent electricity passing from one point to another. Typical examples are the plastic covering on cables, plastic cases around electronic circuits and the body of circuit boards which support copper tracks but keep them isolated from each other.
There are 52 possible answers given in just one source (see link below). Other sources will provide different options.
AnswerThe letters, R-S-T, have been used in Germany (and other countries) to indicate each line conductor (or terminal) of a three-phase system. The sequence of these letters also indicate the standard phase sequence of the system -i.e. the order in which the potentials of each line reach their maximum values. There is no particular relevance to the choice of letters, R-S-T, other than the fact that they are in sequence.Other countries use different letters, numbers, combinations of letters and numbers, or colours to indicate three-phase line conductors or terminals. For example, A-B-C, 1-2-3 , L1-L2-L3, red-yellow-blue, brown-black-grey.
The current European Union standard uses the colours brown-black-grey which, no doubt, Germany has now adopted.
It is a misconception that these letters/numbers/colours represent 'phases'. They always represent lines. Phases are connected between lines (delta systems) or between lines and neutral (star/wye systems) and, so, are identified as A-B, A-N, etc.
What are 15 things made out of wire?
Fifteen things made out of wire include:
- chicken wire (fencing)
- wire basket (kitchen item)
- braces (for teeth)
- electrical and telephone wires (with insulating coating)
- coat or clothes wire hangers
- stereo speaker wire (with plastic coating)
- (landline) telephone cord (indoor, from jack to phone; covered with plastic coating)
- a spring in an expandable hair clip
- car battery cable wires (coated)
- other car engine wiring (coated)
- the insides of a lamp
- electrical wiring in a house or building (coated; insulated)
- wire connectors between a furnace fan / motor and the furnace
- computers (coated; soldered to components in a laptop or desk top), or other electronics (boom box; stereo; radio)
- any small motor, for example, in an electrical desk fan, box fan, etc.
- grates used as platforms in cages for small animals
- to attach and hold boards together (example, some smaller fencing)
When does the diode not allowed to flow the current?
A diode is a one-way gate for electrical current to flow through. You must have the right size diode for the amount of current that will be used in your circuit.
The stripe on the diode is your output end. That is, the current must enter your diode at the non-stripe end and leave at the end with the stripe. This coincides with the diode symbol used on your schematic. If your diode is in backwards, the circuit will not work as the gate in the diode will block the current just the way it should.
What is a voltage droop used for?
The purpose of a voltage droop is to intentionally reduce the voltage of a device. Further information about why and when one would do this can be found on Wikipedia.
Device used to step voltage up or down?
As transformers do not work with DC., the answer is a voltage divider network (step down) or a voltage multiplier network (step up).
What advantage in a parallel twin-cylinder motor does a 180 degree crank have over a 360 degree one?
A 180 degree setup will allow for two power pulses per revolution, and thus a smoother power delivery. Additionally, there would be lower side loading on the crank due to the counterbalancing effect of one cylinder travelling the opposite direction from the other at all times.
A 360 setup will give a larger power pulse half as often, similarly to a large-displacement single cylinder engine (commonly referred to as a "thumper"). This can be advantageous in soft ground for avoiding wheelspin.
_____________
EDIT:
The original answer above is true only for 2-stroke engines, however I feel the original question may have been referring to 4-stroke.
For 4-stroke, it takes 720 degrees to complete the entire cycle in 4-stroke engine. Therefore, the effects would be the opposite. 360 setup would have beats equally timed apart. 180 setup would have more inherent vibrations but would have closely timed 2 beats, resulting in bigger momentarily 'kick', 'hook' or 'bite in the dirt" followed by longer 'recovery', which may or may not be advantageous depending on applications.
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order of phases:
0-180 degree
180-360
360-540
540-720
4-stroke, 360 degree setup:
(occurring in #1 cylinder)
- intake
- compression
- SPARK & POWER
- exhaust
(occurring in #2 cylinder)
- SPARK & POWER
- exhaust
- intake
- compression
4-stroke, 180 degree setup:
(occurring in #1 cylinder, same as above in 360 setup)
- intake
- compression
- SPARK & POWER
- exhaust
(occurring in #2 cylinder)
- exhaust
- intake
- compression
- SPARK & POWER (right after #1's SPARK & POWER)
_____________
1,000 ohms and 3,000 ohms in series = total effective resistance is (1,000 + 3,000) = 4,000 ohms.
Power dissipated = I2 R.
I = sqrt( P / R ) = sqrt (.025/4,000) = sqrt(6.25 x 10-6) = 0.0025 A
Voltage drop = I R
Across 1,000 ohms, V = 1,000 I = (1,000 x 0.0025)
= 2.5 volts.
What will happen if you connect identical integrated circuits in series?
Connecting integrated circuits is not the same as the much simpler cases of resistors, capacitors, inductors, motors, light bulbs, etc.
Integrated circuits have designated functions, and they operate in concert with the surrounding circuit design. As such, the idea of "connecting identical integrated circuits in series" has no meaning in the general case. You would need to state what kind of integrated circuit is involved.
The first capacitor was the Leyden jar, invented independently in the mid-1740s by both Ewald Georg von Kleist and Pieter van Musschenbroek.
What is the total voltage for R1 20 ohms R2 30 ohms and R3 18 ohms?
As you have not supplied any information, other than the resistance of the individual resistors, there is no way in which your question can be answered.
Is wattmeter reading under no load test is equal to iron loss of the transformer?
Yes; that is the principle used in no-load tests on transformers. The current in the copper windings is zero on the secondary and low on the primary, so the copper loss is negligible.
if we take 11kv /33kv yhe current produced will be less when compared to 230v/11kv.. the curent produced will be gerater than 1000amp or above
so the winding of the transformers will damage because thier is no winding at present to with stand the huge amount of current
by
K.B.N.GANGADHAR
sasi institute of technology and engineering
What is the symbol of an autotransformer?
A coil symbol with a tap (usually close to one end, but not always).
What kind of power is required to supply both resistive and reactive components of a load or loads?
You may be fishing for the answer "AC" or "alternating current", since
no reactive component of power is developed in response to DC.
AnswerSince true power (in watts) is associated with resistive components, and reactive power (in reactive volt amperes) is associated with reactive loads, the vector-sum of these is called apparent power (in volt amperes). So the answer you are looking for is apparent power.
What is the Difference between single phase current and three phase current?
given a balance three phase, three wires system with star-connected load for which lime voltage is 230v and the impedance of each phase is (6+j8)ohm. find the line current and power absorbed by each phase.
How do you design Power supply for 0-30V and 2A?
Electricity,a power supply has a positive and negative charge,this charge is used by metal,and the metal,or any electric conducter charges from the,negative charge,and the conponent goes out the,positive charge
