help friends urgent pls

[yusuf.businessmen]

friends i have two power supply as follows :

1) 10 volt and 36 ma current and ..
2) 2 volt and 2 ampere current

this both supply is dc ..
if i connect this supply in series what will be the output current.. ?

i have to 12volt and 2 ampere load ?

pls help ?
thanks in advance ?

 

[alexan_e]

What you are thinking does not work, the 10v dc source can not handle the 2A current, it has a rating of 36mA.
when sources work in series the voltages add to each other but the output current has to flow through all of the sources.
You have a 4W source 2v*2A=4W and a second one 10v*0.0036=0.036W,
how do you expect to get a 12v*2A=24W output, you can 't create energy from thin air.

Alex

 

[yusuf.businessmen]

ok thanks ? friend I have 120volt and 20ma current ac ?
I want to convert it into 12volt and 2 ampere dc ?
friend pls help ?

 

[djsfantasi]

120 volt and 20ma gives you 120 * .020 = 2.4 Watts
12 volt and 2A requires 12 * 2 = 24 Watts
Like alexan said - you cannot create energy from thin air.
You might get close if you had 120 volts at 200ma...

 

[yusuf.businessmen]

friend but i have seen in many charger that their input voltage is 100 volt and current is 200ma and output is 12volt and 2 ampere ?
pls give any ideas of circuit to accomplish this ?

 

[djsfantasi]

You have changed the input amperage again... The same calculations we have shown you still apply.
100 volt and 200 ma = 100*.2 = 20 watts
12 volt @ 2 a = 12 * 2 = 24 watts
Fairly close and if the input is 120 volts (typical US mains voltage), you get 24 watts in and 24 watts outs. The laws of physics are not violated and it is doable. You are not "creating energy from thin air".