1. INSULATOR i Current i = 0 Total mobile electron charge = 0

2. CONDUCTOR i Current i = Q – / T Total mobile electron charge = Q – Transit time = T Total fixed positive charge = Q + = Q –

3. MOSFET DrainSource Channel idid Gate igig Gate oxide Gate current i g = dQ + /dt Gate current i g = 0 Drain current i d = 0

4. MOSFET DrainSource Channel idid Gate igig Gate oxide Drain current i d = Q – / T Total channel electron charge = Q – Transit time = T Total gate charge = Q + = Q – Gate current i g = 0

5. MOSFET DrainSource Channel idid Gate igig Gate oxide Drain current i d = Q – / T Total channel electron charge = Q – Transit time = T Total gate charge = Q + = Q – Gate current i g = dQ + /dt igig Drain current i d = 0

6. BJT Current i c = 0 (insulating/off state) Collector (n)Emitter (n) Base (p) icic ibib Current i b = dQ + /dt Current i b = 0 Current i b = Q + / L L = minority carrier lifetime

7. BJT Current i c = Q – / T Total mobile electron charge = Q – Transit time = T Total fixed positive charge = Q + = Q – Collector (n)Emitter (n) Base (p) icic ibib

8. BJT Current i b = dQ + / dt (< 0) Collector (n)Emitter (n) Base (p) icic ibib ibib

9. BJT Collector (n)Emitter (n) Base (p) icic ibib Current i b = 0 Current i c = 0