Physics Builder Tools > Device Systems > Device Equations

Device Equations
Right-click a Device Model or Device Model Feature node and choose Device Equations () from the Devices submenu.
Device Equations
Fill in the table with Left-hand side and Right-hand side of an arbitrary number of Device Equations. You can use any device variable, device input, or device constant in these equations. If you wish to use non-device variables, add a scope specifier to the variable.
Assume for example that you want to use the variable A declared by a variable declaration in a device equation. In an ordinary expression you just type A, but in a device equation, the parser assumes that this is a device variable named A. Instead you type phys.A to specify that this is a variable outside the device context.
For valid entries in the Dimension column, see Variable Declaration.