Variable resistors, such as a potentiometer, reostat, trimmer, etc., may use a sliding contact, or brush, touching the resistance-media to increase or decrease resistance. There are many types of resistance media, as previously noted. Computers and related equipment often use resistors made from carbon compounds and conductive plastic. Typically, the sliding contact is moved by either a knob or a round slotted head which can be turned with either your fingers or a screwdriver. For example, a light-dimmer uses a potentiometer to increase or decrease the amount of illumination that a light bulb produces by decreasing or increasing the resistance to the electricity flowing to the light bulb.
Cerment pots have similar reliability to carbon pots and can serve as substitutes for the original.
RHS Right Hand Side. Refers to the arithmetic or transfer part of a processor's internal cluster. RISC Reduced Instruction Set Computer's processor. They can support only software handshaking. A dedicated control wire is required for hardware handshaking.