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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
What type of device produces alternating current?
A "generator" usually produces DC current. An "alternator" usually produces AC current. Older cars up to the 1960's used generators.
Newer cars use alternators (simpler design) with diode rectifiers to convert the AC to DC. Batteries are DC.
Some electronic circuitry (inverters) can change DC to AC.
What are the applications of Y-parameters?
1.transient analysis
2.discrete time analysis
3.hybrid pi model
4.location of poles
If a bulb has 50 Hz frequency and it's supply is 60 Hz frequency, it will still glow, despite the allowance of 10 HZ frequency.
What is quality factor for choke coil?
the quality factor for choke coil is impedence divided by resistance in a given circuit
It doesn't! Ohm's Law simply states that for a limited range of conductors, the ratio of voltage to current is constant for variations in voltage. No mention of resistance. And Ohm's Law only applies to a relatively-small number of conductors; most materials and electrical devices such as diodes, etc., simply do no obey Ohm's Law. Those that do are called 'linear' or 'ohmic' materials or devices; those that don't are called 'non-linear' or 'non-ohmic'.
The equation, V = IR (or, more specifically, R = V/I ) comes from the definition of the ohm, and NOT from Ohm's Law.
When resistors are put in parallel with each otherwhat happen to their resistance?
Call the total effective resistance 'R'. If the values of the individual parallel resistors are 'A', 'B', 'C', 'D' etc.,
then 1/R = (1/A) + (1/B) + (1/C) + (1/D) etc. Or, R = 1 divided by { (1/A) + (1/B) + (1/C) + (1/D) } The more resistors there are in parallel, the SMALLER the effective resistance becomes.
How do you calculate voltage drop for starting motor current and how to get the starting pf?
How do you calculate voltage drop for starting motor current
Dynamics in 1831 of electric generator?
I don't think electric generators existed in 1831. Anyos Jedlik had just started his research on dynamos then.
How does voltage drop related to impressed emf?
Voltage drop is resultant of IR ie current and the line resistance, not dependent on impressed emf
Does the individual branch current depend upon the number of branches in a parallel circuit?
No. It only depends on the potential difference between the ends of the individual branch.
If this is the power supply voltage, then the number of other branches doesn't matter.
Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital. Pilot signals and training symbols (preambles) may also be used for time.
How many ohms does three kilo ohms multiplied by three micro ohms equal?
(3 x 103) x (3 x 10-6) = 0.009 squared ohms ... a quantity with no physical significance
In a magnetic material hysteresis loss can't be reduce to zero Why?
In normal ferromagnetic material, the magnetic domains within the material are randomly oriented. When an external magnetic field is applied, it causes the magnetic domains to align more or less in the same direction. During the second half of the AC cycle, when flux is flowing the opposite direction, extra energy is required to flip those domains all the way around to face the other direction. And then, in the first half of the next AC cycle, they have to flip all the way around again. That extra energy is the hysteresis loss.
And air capacitor is usually a motion capacitor whereby plates mesh to form a different capacitance using air as dielectric
I think the answer is: if you input voltage to a grounded center-tapped secondary transformer winding, only 1/2 the voltage is applied to each rectifier at a time (sine wave), therefore the rectified voltage measured would be 1/2 that of the total voltage. The peak voltage would be 1.4 x RMS. Hope this helps.
How do you increase starting torque in cage type 3-phase induction motor's?
by adding external resistance to the shaft of rotor
10 feet
Lightning carries Alternating current or Direct Current?
Power lines carry electricity as alternating current.
I was in physics student's science organization, and we were playing with Tesla generator a lot. After a few experiments we started saying, "Given a high enough voltage, even wood becomes a damn good conductor".
However, if it's REALLY dry and voltage is below, say, 20-30 thousand volts, you could use it as an electric pole or isolator. But it would a be a lot better to search for materials with better isolating properties.
Can you top up a transformer on load?
You will have to restate your question. What do you mean by 'top up'?
How do you answer drop me a line?
When someone says "drop me a line," they are inviting you to get in touch or communicate with them, usually through a quick message or note. A good response could be, "Sure, I’ll reach out soon!" or "Absolutely, I’ll drop you a line later." This shows you're open to connecting and acknowledges their request.
