How Do You Convert Voltage to Current in a Pressure Measurement System?

[NeRdHeRd]

Homework Statement

A pressure measurement system uses a sensor that converts pressure into voltage according to the transfer function, Vp = (.5)(square root of P). This voltage is then converted into a current. As pressure varies from 0 - 100 psi, the current varies from 4 - 20 mA.

A. Find the transfer function equation for the conversion of voltage to current.

Known variables
P = 0 - 100 psi
I = 4 - 20 mA2. The attempt at a solution

I would attempt a solution if I knew where to start. The best I can do so far is use the given transfer function of Vp = (.5)(square root of P) to convert pressure into voltage. After that I'm at a loss as to where to get the equation for the conversion of voltage to current. Is there anyone out there that can point me in the right direction?

 

[jhicks]

Yeah that's pretty vague; There is an infinite amount of different functions you can fit to the 2 endpoints given. You can use linear interpolation for the easiest transfer function based on your thinking of grabbing the corresponding voltages to the pressures/currents.