Piezo actuators produce mechanical displacement proportional to the voltage across that element. To produce larger displacements, multiple identical actuators are connected mechanically in series: the total displacement is the sum of the displacements of each piezo element. The components electrical connections can be either series or parallel. Problem: a) The power supply voltage needed to produce a given total displacement is... 1) Higher for series than parallel 2) Equal for the two configurations 3) Higher for parallel than series b) Explain why