1. Electrical-Mechanical Transduction

3. For the generalized capacitor (potential energy): For a linear electrical capacitor: ε – permitivity A – area G – Gap

18. Comb Drive – Another version of the electrostatic actuator. What is different? Before, C=  A/g Now, C=C 0 +C 1 x Linear in x, the direction of motion. Consequences? The Force is constant.

19. Look at one finger, treat capacitance as that of a parallel plate capacitor: Then C=  A/g. A=lt. C=  lt/g, but remember that g is a constant. So, C=  lt/g=C 1 l (or =C 1 x)