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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
What are the applications of bandstop filters?
for...example..you..have..frequency...range...of..f1-f2-f3-f4,
now..your..work..requires..you..to..avoid..frequency..band..of..f2-f3....
what..you..will..do???you..have..to..avoid..or...reject..that..particular..band...so..you..will..
have..to..design..a..filter..circuit..according..to.the..requirement..
What happens to the resistance as the conductor is measured?
The longer the conductor the greater the end to end resistance.
Give atleast 6 to 7 differences between conventional current and electric current?
can't as there is only one: they are in opposite directions.
conventional current flow was defined arbitrarily before the discovery of electrons to permit mathematical analysis of circuits. electron current flow was defined after the discovery of electrons.
When there is a break on the circuit what is the reading?
The typical answer is current is zero when there is a break in the circuit. It depends on the complexity of the circuit, there may be other paths for the current to flow, such that if there is a break in one part of the circuit, the rest of the circuit still has current flow (but a different value than designed).
If you are reading voltage, and there is a break then that will change, also depending on the complexity. If it is a single loop, and you're reading voltage before the break, your voltmeter will read the same voltage as the voltage source, since there is no current flowing between any resistors between the meter and the source. If you're reading voltage after the break then the meter will read zero (0) volts.
What is the operation of Mosfet?
Depending on the type, in a simple explanation mosfets are similar to a relay, in the sense that when current is applied to one leg, the other two legs are connected together. Some mosfets also pass through the supplied current that closes the mosfet, and some do not.
You need to calculate the equivalent resistance. For instance, if the three resistors are connected in series, simply add all the resistance values up. Then, you calculate the current (in amperes) using Ohm's Law (V=IR); that is, you need to divide the voltage by the resistance.
How can you tell if a 3 prong outlet is grounded?
=== === Tie the bare ground onto the ground screw in the back of the box then tie green wire from outlet to bare ground with a "wire nut", also known as a "marrette", or with an equivalent kind of secure electrical connector.
=== === <><><> If you must go with a 3 prong outlet, ground the box. I would recommend a 4 prong outlet as it meets modern code and is safer.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
How a transistor acts as an amplifier?
A transistor has three sections, an emitter, base, and collector. By extracting a small number of electrons from the base, a large # of electrons can flow across the transistor from the emitter, thru the circuit, and back to the collector.
What is ULN2003 integrated circuit?
as a buffer circuit... means whenever u need a high current....
e.x-> if u wnat to run a 12V relay using a PC parallel port(DB-25) output, u kan use such a TTL IC.... if u just connect the relay it will never switch!! the current in a parallel port output will just be enough to light 2 series LEDs....
ULN**** ICs are used in circuits that use PIC ICs(micro controller)..... Also ULN**** series ICs has low power dissipation...
-R-
A 2000 watt heater connected to a 120 volt circuit will draw a current of?
Current (amps)=Watts/Volts =2000/120 =16.75 =16.75 amps
What is tapping in transformer?
Transformers may be supplied with an LTC (load tap changer) that physically adds/removes windings from one side to control the voltage output of the transformer. If the LTC is moving, it is referred to as "tapping". An LTC has several discrete tap positions. The ones I see most often have 33, 16 up, 16 down, and a neutral.
What is the Effect of tolerance on power of the resistor?
For example, a "220 ohm" resistor with a tolerance of 10% (silver band) has an actual resistance somewhere between 198 and 242 ohms.
When is electrical energy transferred?
Through conduction and induction. Electrons stay generally in the same place while the energy is imparted through the wire. Resistors and capacitors deal with electricity in their own ways. Caps store and discharge energy while resistors can set voltage levels and current flow. In a transformer, two coils on a metal frame can impart their energy on one another, actually transfer it. This happens through the magnetic fields described by Faraday. The active elements in electronics are numerous but few effect the flow of electricity more than the modern transistor. It has almost totally supplanted the tube as a control device. The transistor can control large amounts of current in its' different iterations, the SCR, Triac, FET, IGT, etc.
When a parallel LC circuit is tuned to resonance will the current be at a maximum or a minimum?
Inside the circuit loop between the inductor and capacitor the current will be at maximum.
Outside the circuit the current through the LC tank circuit will be at minimum.
It depends on where you are measuring it.
What are the advantages and disadvantages of a series circuit?
The main advantage to wiring a circuit with multiple accessories and access points into a series is that one main switch can control them all. This can allow a single circuit breaker, fuse, or the operator to disable them all in one step.
What is the weakest link in an electric circuit a switch a receptacle the pilot lamp or the fuse?
The fuse, because it is expected to fail first on any fault.
What is the difference between voltage ang current?
voltage: it is the potentail difference between two wires. or it is the amount of energy used to force the electrons.
current: it is the flow of free electrons.
by Balaji,NITC
AnswerThere is no such expression as 'potential voltage'. 'Voltage' is simply another word for 'potential difference'.
Can you replace mosfet with an bjt transistor?
A MOSFET (metal oxide semiconductor field effect transistor) can be used INSTEAD of a BJT (bypolar junction transistor, so transistor is redundant in your question), if the circuit in question is modified to allow it and the MOSFET is chosen appropriately. BJT's will usually have a higher intrinsic gain, but have lower input resistance. Also a BJT in general will work better at higher frequencies than a MOSFET (unless you choose a high frequency MOSFET) due to the capacitive nature of MOSFETs.
What are the advantages and disadvantages of a double pole circuit?
A double pole switch can be used in either a 240V application where you'll need to disconnect 2 "hot" lines, or it is useful when switching a light from 3 different switches.
Disadvantage?
I suppose it could be a little confusing to face all those contacts on a double pole switch.
Does closing a switch allows electrical charges to flow in a circuit?
Closing a switch makes a closed circuit
Opening a switch opens, or breaks the circuit
One horsepower is equivalent to 746 watts ( = joules of energy per second) or 550 ft.lb (force) of work per second.
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The horsepower or hp is the Imperial unit of measurement for power.
"Power" is the scientific term used to describe "capacity to perform some work".
These days, in most countries, it has been replaced by an SI unit, the watt (or, in practice, kilowatt).
The term brake horsepower refers to the rated output power of a machine, which is not to be confused with the amount of input power it requires to be able to generate that amount of rated output power.
In the case of a car engine, the brake horsepower (or kilowatts) is the power remaining after all the losses have been taken into account. (Heat emitted, gearbox friction, etc.) In other words, output power (brake power) is input power minus losses.
For more information see the Related link shown below.
