Voltage sources include: dry cell (alkaline, NiCad, NiMH etc), solar (photovoltaic) cell, battery (of cells), or a generator.
A power supply that plugs into the wall does not make current, it only converts it. Likewise, a transformer does not make current, it only converts it as well.
To make current, place a resistor across the voltage source. Use Ohm's law. R = V / I
If you have a 1.5 Volt AA size alkaline cell (sometimes called a battery, but "battery" means more than one), then:
1.5 V / 0.1A = 15 ohms.
1.5V / 10 A = 0.15 ohms
If you want this adjustable, you'll need two resistors in series: one with a fixed value of 0.15 ohms, the other, a variable resistor with a value of 0 to (15-.15) = 14.85 ohms.
Of course, this assumes the resistor IS the load. Most likely, you'll want to deliver the current to some other load. Then, you're not just making current, but rather, converting it for use elsewhere.
By using a step down transformer you can increase current.
Ohm's law: V=IR.
So, if you want to increase current by 100 times then increase voltage by 100 times.
Or, reduce resistance by 100 times.
USING CURRENT LIMITING CIRCUIT TO CONTROL A 10A DC POWER SOURCE.
