what does a transformer do?Is it convert d.c. to a.c.or converts current to voltageor vise-versa?uses of transformers?

please tell me why transformers are used?wheather it is possible go without transformers?is the supply of current to homes a.c. or is it d.c.?give some examples of appliances that works on a.c. and some that works on d.c.

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frollard7 years ago
This sounds a lot like a homework assignment :D

a transformer converts one voltage to another voltage; trading off voltage for amperage, while maintaining the same wattage (ideally, excluding heat loss).

Used with a RECTIFIER it can turn AC to DC.

Used with an INVERTER it can turn DC to AC

It's often misused as a term to describe all of the above - when really a transformer literally just converts voltage.

Possible to go without transformer:  Only if you want to let the magic smoke out.
Some homes have both AC and DC, some homes play ACDC music.
Marty121 year ago

I have all this voltage and I can't even run a f#### fan please tell me what I doing wrong cheers marty

Marty121 year ago

Also how do I put a switch in to discharge two 250 caps

Marty121 year ago

hey mate I understand what your saying can you please tell me if I have a flash circuit from a camera is the transformer converting dc to ac for theflash or is it still dc marty

You see, homework is work that you do. Now, I'm thinking, well I've needed homework help before, plus I know the answer so why not help? You know why? Because now, I have this (not so) strange feeling that you just want this as an excuse to use the computer during homework time. So you're sitting at the computer, quickly writing this as a (bad) cover up and then going to play Tribal Wars or whatever you like to play.

                                                      I'm doing this for your own good.

But you could try Wikipedia, Google, Yahoo!Answers or any other search site.

                           Good Luck!
lemonie7 years ago
What do you want from us?
Yes it sounds like homework to me, but part of homework is to do a bit yourself, then ask for help.
Do your parents know nothing about this? Try 'em, they might surprise you.

A transformer is a car that can turn into a robot, or vice-versa.
Seriously though, haven't any of you kids heard of Wikipedia?  Wiki has a very good article on transformers and how they work.

Perhaps in the vernacular, you have heard the word "transformer" used or misused to describe some kind of  AC power adapter, or "wall wart", of which there are many styles. 

The simplest of these truly is just a transformer, taking the mains AC voltage from your home (typically 120 or 240 VAC) as input,  and "transforming" it into a smaller AC voltage ( e.g.  12 or 24 VAC).   A transformer has the property that the ratio of its input AC voltage to its output AC voltage is the same as the ratio of the number of turns on the input side to the number of turns on the output side.

A rectifier circuit, usually constructed from a few diodes, plus a filter capacitor, is used to convert AC power into DC.

One way to design a AC to DC power adapter is to simply use a tranformer plus a rectifier circuit.   The transformer converts high voltage AC to a low voltage AC.  Then the rectifier circuit converts the low voltage AC into low voltage DC. 

Also commonly found these days are AC to DC power adapters containing a miniature switch-mode power supply, the design of which is more complicated.

Since you asked for examples...  

Radios, and other portable media players (e.g. cd, dvd, mp3) typically run on DC power, at voltage levels around 5 to 12 VDC.  The same is  true of computers with the caveat that the computer designers usually use several different DC voltages internally, optimized for each component,  e.g, 2.4 V for the processor, 3.3V for the RAM, 5.0V for other logic circuits and some motors and actuators, 12 V for larger motors,  e.g. in a hard drive or DVD drive, etc.

Mains AC at 120 or 240V (depending on what former country you live in) is typically used for appliances that require large amounts of heat or mechanical power. E.g. toasters and waffle irons, because they need a lot of heat.  Washing machines, large fans, mixers, etc, run on mains AC, because they need a lot of mechanical power.

Re-design7 years ago
You do seem to off to the wrong track somewhat.

Google "transformer" and you'll be presented with more than enough to give you the answer you desire.
Prfesser7 years ago
This sounds suspiciously like a homework assignment...

I think you'll learn a lot more if you'll  look up the material and read it yourself.  You might get some insight by looking at the printing on your appliances at home.

Good luck!