Units: obj
Watt:
in W: var integer
+:
in V: var integer
out R: var integer
:=:
in X: ref Watt
Volt:
in V: var integer
*:
in X: ref Ampere
out W: ref Object
Ampere:
in A: var Integer
d: var integer
W: obj Watt()
V: obj Volt()
A: obj Ampere()