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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
How do you test for fluctuating line voltage in the electrical supply to a motor?
This depends on whether the voltage is AC or DC but an oscilloscope is the tool of choice for seeing voltages and how they change with time.
tuned circuit consists of resistance and capacitor so this one RC circuit formula to be used f = 1/ 2 pi RC
What is the purpose of using transformer in electric bell circuit?
To supply the bell, because the latter has a rated voltage that's lower than the mains.
How do you calculate electrical power?
Voltage x current. In a resistor for example it is the voltage drop across it that is relevant, it may be part of a circuit.
Although it's been a while, I am nonetheless almost irresistibly tempted
to rush in here, where so many others might fear to tread.
I'll asume that I0 and Y0 are the least significant digits on both sides.
Then Y3 = 1 when I8 or I9 = 1 . Then the output is [ 1000 ] or [ 1001 ] respectively.
So now I have to dredge up how to say that in Boolean.
How about . . .
Y3 = (I8 + I9) (not-I0 not-I1 ..... not-I6 not-I7)
or the equivalent . . .
Y3 = (I8 + I9) AND NOT(I0 + I1 + ..... + I6 + I7)
But wait ! All of the lower decimal input lines ARE zero when the
input is 8 or 9, so I don't have to specify them.
Y3 is just (I8 + I9) .
Sometimes I amaze myself. What else could my hard-drive have
accomodated, if only I had deleted this stuff 50 years ago. I felt
that I'd need it some day, and ... son of a gun ... I did, just now !
In the circuit shown if the value of the reactive component was increased?
if the value of the reactive component was increased, how would it change the waveforms?
Does a rectifier voltage regulator for a 1992 yam-aha fzr have to be the exact one or any?
There are several after-market compatibles:
http://www.jpcycles.com/Search/ProductDetail?sku=ZA38554&N=28003866%20274669&Ne=0&Ntk=All&Ntt=&Ns=DefaultSort&results=10&Nao=20
I just replaced mine with an original but I didn't realize how hot they run. Get one with heat fins to reduce the risk of another burn out.
Should voltage going into home be 250V?
Its a bit on the high side, as measured between L1 and L2, but not a problem. Better for appliances than a low voltage. Lights will tend to be a just bit brighter and use a bit above rated power. Certainly a big problem if measured between either live conductors and the neutral.
Which of these are not components of all electrical circuits?
This question makes no sense whatsoever without the list of alternative options that are missing from it...
There is no point in copying and asking this kind of incomplete fragment from such a homework or exam question.
Why is there a resistor on a 36v solenoid?
It reduces contact noise by reducing large voltage and current spikes as the relay is opened and closed, called a snubbing resistor.
Before the age of solid state controllers, there were no resistors across the solenoids. The purpose of the resistor is to provide a charging voltage for the capacitors inside the solid state contoller. Without the resistor it would take several seconds for the (50,000 microfarad) capacitor to charge and the equipment to run. With the resistor the capacitors are charged while the solenoid is open and the equipment is ready to run at all times.
What is iir filter's applications?
IIR filters have nonlinear phase characteristic which means the output of such a filter is (most likely) a deformed version of the input without the filtered frequency. On the other hand IIR filters might become unstable. So IIR filters are used, when the user is not particularly interested in the output in time-domain but only in frequency-domain, e.g. in audio applications such as speakers...
How can squirrels walk on power lines?
Their thick bushy tails help them balance on a wire. Kind of like tightropewalkers when they hold the balance bar. The bar helps them keep their balance so the dont fall over off the rope. The squirrel's tail is sort of like a built in balance bar, so it dont fall off the power line.
If a circuit has two AA alkaline batteries how many joules of energy does each coulomb of charge?
You need to multiply the number of coulombs by the number of volts. If the two batteries are in series, then you can add the voltage of both batteries.
Why is dual supply used for op-amp?
Dual supply arrangement allows for the output voltage to swing both above and below zero volts, and also gives an output of 0V when there is no voltage difference between the two inputs. An op amp can only amplify a signal to its values in the supplied range. If you want to amplify a signal with negative values then you need a negative supply.
When you turn off the switch of a blow dryer does that create a series circuit?
No, it opens the circuit so that no current flows.
What is the function of an integrated circuit housing?
The housing has several functions:
- protect the tiny fragile silicon chip from damage
- hold the pins stationary, so they do not flop about and short together
- provide a form factor large enough for either manual or machine parts placement on printed circuit boards
- be able to tolerate thermal stresses during operation without having a failure (some early leadless chip carrier housings failed this function as thermal stresses sheared all the solder joints and permitted the devices to fall off the board)
- if its a metal or glass housing, maintain a hermetic seal so that water vapor and other outside gasses cannot enter and cause contamination or corrosion
- in high power devices, provide a good path for thermal conduction away from the silicon chip and the means to attach a heatsink
- etc.
What does a crocodile clip do in an electrical circuit?
The clip is not actually part of the circuit. It's merely a quick and easy way to connect things at
various points in the circuit, or to easily change the whole circuit layout, for example adding or
removing components while experimenting.
Does miliamperes increase as does battery voltage when put in a series configuration?
The current in a circuit, expressed in milliamperes, is
1,000 x (battery or power supply voltage)/(resistance connected between the power supply terminals)
If you increase the voltage of the battery or power supply, the current in the circuit
increases proportionally, at least until something in the circuit gets hot, melts, fuses,
and opens the circuit.
The question is defective. It talks about plural 'lights', but it doesn't tell how many
there are, or in what configuration they're connected to the 12-volt power supply.
All of that stuff has a substantial effect on the correct answer. (But I don't think
the 10m length of the cable has any at all.)
How the size of transistor reduced to place in a single pocessor?
transistor size depends on its channel length, that is the length of the region in which a transistor act as an electron tube.
the shorter the region, the lowest the resistance, the fastest the transistor, etc...
so, it is always good to scale transistor size.
problem is that you have to apply a 'good' electrical field in the channel, in order to drive a good 'ON' or 'OFF' state for your transistor. that's why it's not easy to scale their size.
What is special about electric current in a series circuit?
In a series circuit the current remains the same throughout the circuit. This is not the case for parallel circuits.
How is a capacitor used in a disposable flash camera?
A disposable flash camera uses a capacitor to power the flash unit, employing an electronic circuit to charge a large capacitor. The flash needs several hundred volts to operate, far higher than the camera's battery can provide. The electronic circuit builds voltage in the capacitor, which then powers the flash
