5.1.3
Explain the position sensors
a.
potentiometers
• Potentiometers
– resistive potentiometers are one of the most widely
used forms of
position sensor
– can be angular
or linear
– consists of a length of resistive material with a
sliding contact onto the
resistive track
– when used as a position transducer a potential is
placed across the two
end terminals, the voltage on the sliding contact is then
proportional to
its position
– an inexpensive and easy to use sensor
How Do Potentiometers Work And How To Service Them. Cleaning Volume Controls.
ReplyDeletesource : http://www.youtube.com/watch?v=Q225qr0BctA
Potentiometer applications
ReplyDelete1) Potentiometers are rarely used to directly control significant amounts of power (more than a watt or so).
2) Instead they are used to adjust the level of analog signals (for example volume controls on audio equipment), and as control inputs for electronic circuits.
3) For example, a light dimmer uses a potentiometer to control the switching of a TRIAC and so indirectly to control the brightness of lamps.
source : http://en.wikipedia.org/wiki/Potentiometer