Potentiometers and Rheostats

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Presentation transcript:

Potentiometers and Rheostats EGR 101

Variable Resistors -- Potentiometers Potentiometer – a three-terminal resistor whose value can be adjusted (within set limits) by the user Rac = Rab + Rbc EGR 101

Construction EGR 101

Setting the Value of Resistance EGR 101

Potentiometer Taper Linear – resistance varies at a constant rate Nonlinear – resistance changes at an increasing rate EGR 101

Potentiometer Ratings Resistance Rating Printed in straightforward manner: 5 k Printed as code: 502 = 50 x 102 = 5 k First two digits are the digits in the resistance value Third digit – number of zeros Power Dissipation Rating – consult manufacturer's catalog EGR 101

Trimmer Potentiometers low-power applications EGR 101

Multiturn Potentiometers Much better resolution Smaller percentage of change per degree of rotation EGR 101

Gang – Mounted Potentiometers Two pots share the same control shaft EGR 101

Rheostats A variable resistance used to control current Usually a two-terminal variable resistor Potentiometer can be wired as a rheostat EGR 101

Rheostats EGR 101

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