A related question to current carrying capacity in circuits:

Need a method of calculating current carrying capacity in screened silver 
polymer traces on 0.007" thick polyester membrane circuits.  Resistance of 
the polymer per supplier data sheet is 0.015 ohms/square at 0.001" applied 
thickness.  Typical width of screened trace is 0.025", and the actual 
thickness applied in most real designs is 0.0005".  Length of the trace 
varies with application.
Is there a formula for determining how much current can be carried by the 
circuit?  Voltage is typically 5 VDC.

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