for a diode id we take Id+del(id),here iwant to know both means what and is it like dc constant current and varying current?Please help me

Question

for a diode id we take Id+del(id),here iwant to know  both means what and is it like dc constant current and varying current?Please help me

kenljw · Answer

Diode only conduct in one direction the general equation is
Id = Is exp(Vd/VT)
Is is the reverse saturation current, very very very small
VT = KT/q = .026 V at about 25 degree C or 298 degree K
Vd is the voltage across diode
Id is the diode current
exp is the inverse on natural logarithm generally expressed
e^

anonymous · Answer

i studied that equation id=is((e^(vd/vT))-1)
there should a reverse opposing current that is negligibly small may present in diode

anonymous · Answer

is q that you meant is charge or not