# How do I change Low current DC to high current DC?

Suppose I have a high voltage source of DC with fractional milliampere current. How can I increase the current?

I think Watts is fixed with respect to source. So, if there is 12000 Vdc at 1 milliampere (12 Watts??) I should, in theory, be able to get 12 Vdc @ 1 amp.

Practicality aside, is this correct?

Practicality engaged: Is 12 Vdc at 1 amp possible, and how? 4 amps???

active| newest | oldest12000v is a tricky beast, it wants to jump through most insulation, so you need a very shielded design.

DC doesn't directly convert to other DC without being either inverted or pulsed - because transformers only work with 'changing' electrical current.

...The question is, where on EARTH are you finding voltage potential of 12kv for 'free' (per your keywords)? Even at that rate, anything you built wouldn't be worth 12 watts of power.

The voltages are theoretical. I am waiting to see how much voltage is involved in an upcoming experiment. The conversion will be part of the harvest process.

Thanks

-tapping power-lines?

L

Thanks for the reply.

In reality, I suspect you'll be lucky to get 50% efficiency. You either need a pulsed power supply, or you need to invert the 12 kV DC to AC, run that through a transformer (with losses), then rectify the AC back to DC (more losses).