How to create Variable resistance in MATLAB

Variable Resistor -Simulate linear variable resistor in electrical systems

Library

Electrical Elements

Description

The Variable Resistor block models a linear variable resistor, described with the following equation:

where

V	Voltage
I	Current
R	Resistance, i.e., the value presented at the control port

Connections + and – are conserving electrical ports corresponding to the positive and negative terminals of the resistor, respectively. P is a physical signal input port that controls the resistance value. The current is positive if it flows from positive to negative, and the voltage across the resistor is equal to the difference between the voltage at the positive and the negative terminal, V(+) – V(–).

Dialog Box and Parameters

Minimum resistance R>=0

The minimum resistance value. If the input signal falls below this level (for example, turns negative), this minimum resistance value is used. The parameter value must be nonnegative. The default value is 0.