What about Variable Resistors?
A variable resistor gives the users more control via the resistance, as it allows for variance or for the resistor to be adjusted in order to meet the resistance requirements of the user.
Adjusting the resistance as a user is actually very simple. Devices that utilize variable resistors will have external controls, such as a knob or a slider that can affect the resistance. A great example of this would be a knob on a device that could change the temperature.
Preset forms of variable resistors are available as well. End users cannot change their values. These types are used during production, setup, and testing phases of a product’s manufacture.