{"id":28079,"date":"2017-07-19T21:20:24","date_gmt":"2017-07-19T21:20:24","guid":{"rendered":"\/forum\/forums\/topic\/current-used-in-calculations-as-current-density\/"},"modified":"2017-07-19T21:20:24","modified_gmt":"2017-07-19T21:20:24","slug":"current-used-in-calculations-as-current-density","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/current-used-in-calculations-as-current-density\/","title":{"rendered":"Current used in calculations as Current Density"},"content":{"rendered":"

When defining the electromagnetic condition “current” I think that AIM is actually using the value as current density!<\/p>\n

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When I enter 2 Mega Amps (yes 2,000,000 Amps) my simulation yields a current density of 15915816 Amps\/m^2 in my copper vias. Yielding a total current of 2 Amps (should be 2,000,000 Amps). See my calculations and images below<\/p>\n

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# Of Copper vias: 4<\/p>\n

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Diameter of 1 Copper via = 200 um = 0.0002 m<\/p>\n

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Radius of 1 copper via = 0.0001 m<\/p>\n

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Area of 1 Copper via = 3.14159 * 0.0001*0.0001 = 0.0000000314159 m^2<\/p>\n

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 Current = current density * Total Area = 0.0000000314159 m^2 * 4 * 15915816 A\/m^2 = 2 A<\/strong><\/p>\n

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***NOT EQUIVALENT TO THE 2,000,000 AMPS I ENTERED****<\/strong><\/p>\n

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Therefore you have to enter current density for a known surface area to define the current you want!<\/p>\n

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Either the units for the current need to be changed to Amps per unit area, or the calculation needs to change to allow the user to input desired current values!<\/p>\n

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Can anyone else validate this?<\/p>\n

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\"\"<\/p>\n

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Defining current under electromagnetic conditions<\/p>\n

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