Resistors are electrical components that oppose the flow of either direct or alternating current. They are used to protect, operate, or control circuits. Voltages can be divided with the use of resistors. In combination with other components, resistors can also be used to make electrical waves into shapes most suited to the designer’s requirements. Resistors can have a fixed value of resistance, or they may be variable or adjustable within a certain range. Typically, resistor values are expressed in ohms, a unit of resistance. Materials of construction for resistors include carbon composition, carbon film, ceramic composition, metal alloy, metal film, metal oxide, thick film, thin film, and wire. Common lead types include axial leads, gull-wing leads, J-leads, radial leads, screw terminals, and tab terminals. Resistors without leads are also available.
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