Feedback control requires being able to sense the variable being controlled. Because electrical signals can be transmitted, amplified, and processed easily, often we want to have a sensor whose output is a voltage or current proportional to the variable being measured. Describe a sensor that would give an electrical output proportional to:
(a) Temperature
(b) pressure
(c) liquid level
(d) flow of liquid along a pipe (or blood along an artery) force
(e) linear position
(f) rotational position
(g) linear velocity
(h) rotational speed
(i) translational acceleration
(j) torque