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Circuits
Overachieving and under-appreciated, circuits are the foundation that our technological society is built on. Now's your chance to find out not only how they work, but why. Questions regarding the physics behind voltage, resistance, capacitance, inductance, transistors, LEDs, switches, and power supplies; and how they're used to create analog and digital circuits, should be directed here.
1,646 Questions
'A' and 'C' are saying exactly the same thing.
The correct choice is 'D'.
The complex impedance of a purely resistive circuit is purely real.
Since there is no reactance, there is no phase shift, so the power
factor is ' 1 ', KVA = KW, KVAR = 0, etc.
What is the voltage of main electricity when it enters your house is?
There are different mains supply standards in different parts of the world.
-- It's AC almost everywhere in the world, rather than DC.
-- The frequency of the AC is either 50 Hz or 60 Hz everywhere. It's 60 Hz in all of North America.
-- Mains voltages include 400, 240, 230, 220, 127, 120, 115, 110, and 100 volts AC RMS
in various countries around the world.
In North America, the standard is 120v in the US and Canada, 127v in Mexico.
What materials make good resistors?
I only know one material that make good resistor that is STEEL(if not heated)
A device that increases the voltage of an alternating current is called?
That's called a transformer.
Advantages and disadvantages of differentiator circuits?
At high frequencies an op-amp differentiator circuit becomes unstable and will
start to oscillate. This is due mainly to the first-order effect, which determines
the frequency response of the op-amp circuit causing a second-order response
which, at high frequencies, gives an output voltage far higher than what would
be expected. To avoid this, the high frequency gain of the circuit needs to be
reduced by adding an additional small value capacitor across the feedback resistor Rf .
cannon plugs
Who designed the first integrated circuit or silicon chip?
See related link.
It was two electrical engineers, who were working separately and independently of each other, that came up with the designs for semiconductor chips and integrated circuits.
- Jack Kilby with Texas Instruments
- Robert Noyce with Fairchild Semiconductor.
Both received patents for their inventions in 1959. Their goals were the same but they each took a slightly different approach. The two companies eventually agreed to cross license the technologies to each other.
1.5 volts
would discharge in 18 hours
Which bjt transistor amplifier can be used as a voltage buffer?
the common collector can use as voltage buffer
How can change voltage from 440 v 3 phase to 208 v 3 phase?
I have 12 amps 208/3/60 what would the amps be @ 440/3
Which one launch first 8088 or 8086?
1978 - 8086
1979 - 8088
First IBM PC used 8088.
I think later low end IBM PC's used 8086.
Why two probe method is better than four probe method?
the question is wrongfour prob is better than two prob method as it eliminates the effect of wire imbedance as well as contact resistance
3
A tapped inductor is a coil to which electrical access is available at more points
than only the two ends. Connection points are provided at one or more points
on the coil that are between the ends. Each such point is called a 'tap'.
Which fruit has the highest voltage?
I Believe it to be a lime. awhile ago i had a Science test in which i had to get 2 pieces of metal and connect it to a voltage calculator with croc clips. I used Magnesium and and Copper, which gave the highest results. i used a lemon which gave better results than any other fruit and it was 1.87 volts. it may have something to do with the acid in the fruit, of which lime has more acid. that is my theory
5 advantages of digital technique over analog?
anu ba yan ikaw yong naghahanap tapos ikaw pa yung hahanapan.
The SI unit of capacitance is the farad.
1 farad is 1 coulomb per volt.
What is a T1 circuit uesd for?
T1 usage is for Voice or Data.
T1 is 23 Voice Trunks or 1.5 Mbps.
Can be channelized to do both at the same time.
www.intelletrace.com
Function of dielectric in a capacitor?
The main role of dielectrics in capacitors is to increase the value of capacitance of the capacitor.
What is use of Automatic gain control circuit?
Watching television or listening to the radio may be interfered by various sources noise.
Aircraft noise is extremely loud and researchers succeeded to reduce a few notches on noise meter. Railway noise also causes disturbances to local residents. In addition noise may come from traffics or viewers of television may start talking suddenly. Viewers of television may sit in a noise insulated room. Noise of that room may increase due to sudden opening of door. Automatic volume control will help user in understanding programs of television in all mentioned noisy situations. When user-defined volume high level is smaller than volume level required avoiding noise, user may feel further obstruction. While one or more viewers of television/ listeners of radio are talking or making noise volume will raise. Listeners will be warned about their noise through raise of volume automatically.
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Response #2:
(Answer #1:)
The above treatment is a very nice write-up on the subject of Automatic Volume
Control. The question, however, inquires regarding Automatic Gain Control (AGC).
AGC is implemented in a feedback loop inside any device where amplification takes
place, usually a radio receiver, video, or audio amplifier
, where portions of the circuit
work best only within some narrow range of signal level. When sub-circuits like that
are present, the signal level input to them is kept constant by preceding circuits
that sense the signal level, and adjust their gain appropriately so that their output
level ... and the input level to the following stages ... is held steady.
Often, the extent to which these control circuits are reducing their gain is brought
out to a single measuring point, and the voltage at that point is the source of all
the information available to indicate the strength of the signal arriving at the antenna.
Why is the EHT voltage higher in a color TV than in a monochrome TV?
Colour picture tubes use a shadow mask, or aperture grill, to ensure each electron beam lands on theright phosphor - same principle as a pin hole camera. But the shadow mask blocks a significant proportion of the beam. A higher accelerating voltage helps overcome that effect.
Is there a direct or inverse proportion between voltage and resistance?
There is an inverse proportion between voltage and resistance according to Ohm's Law: V = IR, where V is voltage, I is current, and R is resistance. This means that as resistance increases, the voltage across the circuit decreases, and vice versa.
A braking resistor is used in motion systems where a motor in controlled by a drive. Typically, these are high-speed servomotors controlled by a servodrive. When accelerating, electrical energy is converted to a mechanical force to move a mass. When decelerating, that kinetic energy is converted (via the motor) back into electrical energy, and must go somewhere. To brake quick enough, the energy must be dumped into a power resistor, to be dissipated as heat.
Read more at the link provided below.
