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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

Swamping resistor is made up of?

Swamping resistor is mostly made of manganin or constantan because these materials have temperature coefficients very close to zero thus there is a very less change in the resistance of these materials with change in temperature.

What is transistor BC557?

it is a transistor used in IR TOGGLE SWITCH.

:-)

What is an fdda circuit?

Full Data(FD) circuits are copper circuits used to transmit low grade data through a network. Most applications (but not all) are in the utility industry. For example the water company will use an FDDA to transmit the level of a well back to their monitoring station and if the level is too low, the operator can tell the well to pump through the receive side of the circuit.

What is a NMOS PLA?

NMOS PLA is a Programmable Logic Array which is designed by employing NMOS technology i.e. by employing nmos transistors to realize the required gates of PLA.

PLA is a combination AND gates and OR gates to produced sum of products terms needed for realizing the required combinational logic. It consists of an array of AND gates followed by OR plane. the connections to the AND and OR inputs can be programmed based on our needs.

When an alternating voltage is applied to a purely resistive circuit the A voltage lags the current B the voltage leads the current Ccurrent leads the voltage Dcurrent is in phase with the voltage?

'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 materials make good resistors?

I only know one material that make good resistor that is STEEL(if not heated)

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.

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 .

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.

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

What is Tapped Inductor?

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'.

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

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.

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

Unit of capacitor is?

The SI unit of capacitance is the farad.

1 farad is 1 coulomb per volt.

Function of dielectric in a capacitor?

The main role of dielectrics in capacitors is to increase the value of capacitance of the capacitor.

5 advantages of digital technique over analog?

anu ba yan ikaw yong naghahanap tapos ikaw pa yung hahanapan.

What type of circuit normally contains a LDR?

LDRs are normally found in Light/Dark sensing circuits