it is essential for a relay energized br alternating current to have?
373742
No.  Relays are designed to serve a purpose, which might not include any of the items you list.  The wire might be high resistance wire and not need a lot of turns (relatively): a laminated core aids in creating the electromagnetism, but is not essential in all applications: high resistance where?  Light weight definitely not.  Again, depends on application:  same answer for the contacts, depends on the application and does not have to be any specific combination other than what is required for the job at hand.
533546
You need two of those as fans. Connect them in series.\n\nOr...\n\nIf you don't have two of it, get an appliance which has the same rating and connect them in series.\n\nOr...\n\nPlug it to a voltage half its rating.
989966
First, to the basics...\n\nAC is Alternating Current.  This means that the current moves in one direction and then the other, changing at a frequency of 60 time per second, its unit of measurement being Hertz (Hz).  The generator produces this current at very high voltages which are sent down the transmission wires to local substations, where the voltages are reduced to the familiar 110 volts which appears in your electrical panel.   At the transformer of the substation, the transmission lines to your house are isolated from the ground and "float".  This means that there is no path for the current to flow from either wire to the ground or to each other.  Now, in order to use the power (which is a product of the voltage times the current)  the current must flow through a load, which is any energy using device from a light-bulb to a toaster to the pump on you washing machine.  Since both sides of the wire (both the black (hot) wire and the white (neutral) wire) are isolated from ground to begin with, attaching the neutral to the ground does not provide a path for current flow.  Only if a path is made from the black to the white wire will there be current flow.   If we connect a lightbulb between the black and white wires, we will complete this circuit.  Remember that power (measured in Watts) is the product of Voltage (measured in Volts) and current (measured in Amps).  If we know the amount of Voltage (110V) and the power used (say 100W in a light bulb), we can figure that the amps used are 100W / 110V = ~.91 Amps.  If the circuit breaker is rated for 15 amps, it would require at least 17 of those bulbs to exceed the capacity of the breaker and cause it to trip.  I hope this clears things up for you...
95109
This might help\n\nhttp://www.ttec.co.tt/consumertips/conserveelectricity/default.htm
468793
Actually a relay IS a switch. There are many on todays cars (relays and switches).\n\nYour question as asked makes no sense. Didn't your HS English teacher tell you never to end a sentence with a preposition?
882906
Well depends on the max load the circuit can handle. If the circuit can sustain a max load of lets say 10 volts and you push 15 to it, the circuit elements will heat up and fry. Of those elements will include inductors, transformers (up and down) logic controllers, resistors, transistors, capacitors, motors, and a multitude of other components. Lets say computer for example, you would fry the CPU and possibly damage all the attached components! Either way it's a bad situation.\n\nJust increasing the the resistance values of the resistors will not prevent damage. The designing of circuit boards isn't a fly by night type of thing. In some cases you can get seriously hurt or waste alot of money so exercise caution. Good luck.
162542
AC has less loss over longer distance so is better for wide-area power distribution.  It is also better for high-voltage appliances with high amperage demands (like electric stoves, ovens, dryers, etc.).  Also, before the advent of reliable quartz crystals and such, AC provided a reliable timing source to synchronize signals for televisions (AC in U.S. operates as 60Hz) that is was much more difficult to obtain with DC.\n\nHowever, for local low-voltage, low-amperage power DC is more efficient as most of the types of devices that fit into this category cannot utilize AC directly - they need to convert AC to DC.  It would be more efficient to have a single DC power source using step-down transformers to adjust voltage, than have a bunch of separte AC/DC converters.\n\nIncandescent light bulbs don't care which type of current they are powered from (although LED's do).
420188
All you need to do is add the power requirements of all the equipment you will use, not forgetting things such as lighting, air conditioning, extractors, fans, drinks or food dispensers, water or any other heaters, office equipment (computers, fax machines, copiers etc.) \n\nThen speak to you electricity supply company and discuss it with them.
663382
light bulb is the load. conductor would be the way to get the power to the load and other devices , the switch is the way to stop and start the flow of current, the insulator will keep the power from leaving its proper path, the ammeter will tell you how fast the power is being used in amps , volt meter will tell you what the pressure of the power is in volts, the battery is your storage of power.
1040867
Using 3 phase current, it is possible to get 3 times the energy down the same wire - so it is much more efficient.  Each phase is 120 degrees out from the others, so the signal looks kind of like braided hair, when one phase is at the peak, the other two are crossing at 70%, one going up the other going down.  Once we get the energy to where we want to use it, then we can tap off the different phases for single phase use. \n\nI forget about the delta and wye stuff, it's been a while. \n\nCheers!
240043
You use it to check voltage, resistance, continuity, and power in ac and dc circuits. It should have come with an instuction manual to tell you how to use it.
355380
Yah, I got one.\nDo you need the detonator circuit too?
46766
DC generator would have a rectifier built in to convert the AC to DC.
923631
Yes.You have to appropriately reduce the rating and use it at low voltage low current applications.
905900
It depends on whether you simply want a boost in voltage value or a boost in signal power. In order to simply boost the voltage you need a transformer but if you want the signal the be boosted in power also you what you need is a simple amplifier circuit.Amplifier chips are available in IC patches
697985
Hi. You will need two circuits connected through a relay. The horn draws too much amperage to be fed directly through a switch. A momentary contact switch feeds the relay, which closes and feeds the horn. Add your power source and the horn and your golden.
805978
Not sure what three things you're looking for, but here are three good ones:\n1. lots of windings\n2. high current\n3. an iron core