The voltage does not matter since it is the operating voltage of the circuit rather than the actual voltage drop across the trace.  i.e. At 20A, the voltage across a copper trace will still be very small.

Pete

Jamie Jensen wrote:

> Using some of the calculators online, you can get a good idea of the trace width or surface area of the copper for a current draw.
>
> Does it matter on the voltage?  Meaning if you have 1.5V @ 20A vs 3.3V @ 20A, the wattage is different but the calculators do not seem to take this in account.  I am just trying to estimate trace widths for different voltages.  Maybe it doenst matter.
>
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