Q:can i use 12VAC 60w transformer for 12VAC 30w (3 10W) light?

Transformer rating is 60 watts ~ don't use total wattage over that. So with your three 10 watt bulbs, that totals 30 watts. Will be okay. You can actually use up to six 10 watt bulbs, or a total of 60 watts max. Been using light bulbs for 65 years !

Q:Can someone tell me what happened to the primes in transformers. I know Sentinel,Optimus and the fallen but what happened to the others ?

Depends on the continuity. Traditionally, there were not seven, but thirteen original Primes. Neither Optimus or Sentinel were one of the originals, whether you want to say that there are thirteen or seven. Prime is simply a title given to the leaders of the Autobots, passed down from the original transformers. Since you said seven, I'm assuming you meant movie continuity. In that case, Megatronus Prime, later to be known as The Fallen betrayed the Primes' laws of peace, hence his name. The other six used their physical forms to create a vault in which to hide the Matrix of Leadership from The Fallen. The lore from other continuities is much more interesting however. The fate of those versions of the original Primes range from death, to splitting into smaller transformers and scattering across the galaxy, to living in their own pocket dimension in peace, or to chronicling the history of Cybertron, albeit with their true identity hidden.

Q:I have a transformer 12v and 12v need to reduce these further to be able to grow or shrink the rotational speed electromotor.Which device or component would be used to reduce the speed of electromotor?I making a mini escalators

A transformer has AC output, so first get DC, which needs a rectifier and capacitor. Following this is a voltage regulator using an LM317 (adjustable 3 terminal regulator). This can delivers ~1 amp. You should know what maximum current your motor draws under load. The first link is an example for 1.25V-15 V with an 18V transformer. Use a 12V transformer, and a 1000 ohm potentiometer as a variable resistor instead of 2000 ohms (R2). This will give voltages from 1.25V to 7.0V DC. Use the formula to calculate other resistors for a different voltage. Get the LM317 in a TO220 package, and you will need a heat sink, at least as big as in the picture. You can probably find a kit of parts for this in an electronics shop.

Q:Which is good for the transformer?

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Q:A 120-V, 60-H air conductor is to be operated in a remote area where the voltage drop in the long transmission line results in a utilization voltage of 102-V. Determine:A) the required step-up voltage ratio for the satisfactory performance.B) The voltage ratio of a standard buck-boost transformer that most closely meets the requirements of the loadC) The voltage at the load with the buck-boost transformer installedD) Sketch the appropriate connection diagram and show the NEWM standard terminal markings

I already answered this. First, what is satisfactory performance? Is the 102 volts the lowest the voltage reaches? I asked you this last time, and I still don't see an answer. If 102 is the lowest, than adding 10 volts is all you need, as that gets you 112 volts, and any 120 volt appliance will operate fine at 110 volts. A 120 to 12 volt transformer is easy to find, and with 102 volts input you will get 10 volts output, and added to 102 that gives you 112 volts, plenty to operate the AC. Parts of this question read like a homework problem, but parts don't such as the undefined term satisfactory performance, so which is it?

Q:I want my car to be a transformer

According to the institute of space and science in New York, transformers are in fact real. They have been spotted using the beyond galaxy telescope on the planet cybatron, but they haven't ever came to earth before. Scientists are working out a way to communicate with them and by 2015 they think this communication system will be complete and transformers may come to Earth.

Q:I have a US microscope (110v) with a built-in transformer using a 6v, 10w lamp. I want to use this with a 220 v supply. What are the specifications for the cheapest (external) transformer I can use for this purpose?

You do not say what country you are in, so cannot give you links to an exact transformer. You are looking for a 220 to 110V step-down transformer. I am assuming you are going to plug the microscope into the transformer, rather than actually replacing the transformer in the microscope? The rating should be at least 10VA, personally I would go for at least 15VA for safety. That is quite a low rating and if you are lucky, you might be able to find a transformer meant for electric shavers really cheaply that should do the job. There is just one thing that concerns me, are you sure the transformer will only be powering the light and nothing else? If so, you will need a transformer that will handle a greater load. Somewhere on the microscope, or the PSU, or even it's box, there should be a rating Label, you can take the power supply rating from that. It is NOT true that VA Watts, but for something needing so little power, it should be near enough to give you the minimum rating. Good luck!

Q:I remember a Transformers cartoon and there was like a gas in it and if the Autobots were in a place that the gas was in there, they would turn red and turn evil and fight each other. And also Optimus Prime was dead fist and then some Autobots bring him back to life And I think Rodimus has the matrix. What was that movie called?

Yup, that was the episode in season three where Optimus Prime is brought back to life (after his death in the movie). The episode is called Return of Optimus Prime and is a two parter. The red stuff is rage and can pass if you get touched a la 28 days later. This is the episode that had Optimus return to life and get back the matrix from Rodimus (turning again back to Hot Rod). He unleashed the matrix to defeat the rage, but it empties the matrix of all it contained.

Q:Find full load current of transformer. What do it mean by full load current? 100% efficiency, or maximum load in secondary winding?Let R1 32ohm, R20.05ohm, X1 45ohm, X2 0.06ohm.1 is in primary and 2 in secondary winding.R0250kohm, Xm 30kohm(R0 and Xm are the values refered to primary)How to calculate the full load current?

there are many criterion it is application dependant or power it is the load that causes a temperature rise that if loaded beyond it will cause failure of course it depends on the insulation material so a smaller transformer could have a much higher rating because it can stand more heat small electronic stuff will generally be when the transformer can no longer sustain the output voltage Anita

Q:How do you test this transformer with a multi-test meter? It was in a gong style door bell system. The 'clanger' unit has two windings withe the striker arm parallel to the end of the windings. Elaborate please. parts are difficult at my location.

Watts are not equal to VA. VA equals volts times amps, just as do Watts. However, Watts measures power, meaning volts and amps are in phase with each other. Doorbells are inductive, and transformers are inductive, meaning the current (amps) and the volts may not be in phase. That's why it's convenient to rate transformers in VA, because the manufacturer cannot know what load is going to be applied. Generally, watts used in a system will be less than VA, because watts equals VA times the phase angle.