how to set voltages and currents

i can able to design a circuit for particular task but i came to know that is not enough for a practical purpose ,(I mean) we have to take care of all the voltages and current.so, i want know ,how i have to set the voltage and current level at the output of a device to drive a load . please help me.

Though for ur level this might be a small question, but i will help me to do some work .

thank you...

Your question if very unclear. Maybe get someone that can speak english well to write it for you next time.

You can not set both the voltage and current at the output of a circuit. You can only chose the relationship between voltage and current over some range, and the load choses the operating point along that function. Put another way, the ouptut voltage and current are two degrees of freedom. You get one and the load gets the other. So what you are asking (apparently) can't be done.

Hi praveen.
You know you have the power factor you have to consider.so, before you build the circuit investigate what loads this circuit is going to maintain.Second, one of the device's you could try is a diode clamp on the (zener)??.Maybe..For a steady output.
I hope this helps.

sir,
thank u for replying..though u did not understand my language , u are to the point. for example, if we are designing an power amplifier to drive a load of 1000W, then what should be values (either voltage or current ) at the output terminals?
if i can set any one out of two(voltage or current) values , then for what should i give preference?
please reply me...

sir,
some are saying that , i should take the power rating of load in consideration and some say load.
are they both same? as per my knowledge load means resistance..
i honestly dont know it...please explain...

Praveen, "load" merely refers to the thing be driven or powered by your circuit. It is not limited to exhibiting resistance. It could have complex components. Or put another way, the load could also be capacitive or inductive in addition to resistive. Put yet another way, the load could have a arbitrary complex impedance at any operating point. Resistance is only the real component of impedance.

sir,
you mean,we have to consider the power that is required to drive the load.
if so,please explain the following...
for example, if we are designing an power amplifier to drive a load of 1000W, then what should be values (either voltage or current ) at the output terminals? if i can set any one out of two(voltage or current) values , then for what should i give preference? please reply me…

Praveen,

Maybe this is too basic, but you are familiar with the Ohm's Law equations correct?

V = I*R
P = V*I

And the variations by combining the two above...

P = V^2 / R
P = I^2 * R

Do you know what your load is in terms or resistance, and whether or not it has any appreciable inductance or capacitance associated with it as well?

Mr.alec,
thank you for replying.you are right, now we have rated power, and we know the resistance of the load. then, while designing what should i consider , is it voltage or current because for a given equipment, there will be rated voltage and rated current.
please help me..

Praveen,

I'm sorry but the language barrier seems to be making communication too difficult. I've read everything several times and I still don't know what exactly your question is or what problem you are trying to solve.

Perhaps if you post a circuit diagram we may be able to understand better what you are asking?

Communicating technical problems in words is difficult even when people have the same native language.

Mr.Alec,
i want to design an amplifier to drive a load of 1000W. Then from where should i start?

Praveen.
Take a look at Alec's equation..His statement is correct..

I usually start with a good textbook and/or stack of application notes on the subject and a bottle of pain killers for the inevitable frustration headaches that will occur as I try to read through and understand it well enough to accomplish my goal :)

Which research materials you read will depend on what you are trying to do, which is what I think everyone still doesn't understand. "I want to design an amplifier to drive a load of 1000W," is much to broad a statement to be able to give good advice. What sort of power amplifier are you trying to build? What is your application? An audio system? An RF or microwave transmitter? Something else?

What is the application for this amplifier?

Mr.cody,
The application is to drive an audio system(100 watt loud speaker).