14 © 2016 ANSYS, Inc. August 28, 2018
Across and Through Quantities: Conventions
− To measure Across and Through quantities a red dot on the model Symbol is used to describe the
following convention (it is supposed here that the red dot is placed on Pin a side):
− Across quantities: Value is calculated by subtracting the value at Pin b from the value at Pin a
− Through quantities: Value is positive if the quantity flows into the model at the pin marked with
the red dot
passive element such as resistance
voltage source
R.V = V(a) - V(b)
a b
a b
E1.EMF = V(b) - V(a)
E1.V = V(a) - V(b)
R
E1
(voltage drop)
(voltage drop)
(current)
(current)
+
(EMF)
Note: when using voltage sources, it is best
to select the Spice compatible box so that
E1.V = E1.EMF = V(b) – V(a)
