Resistor Terms:
'A', 'B', 'C', 'D/E', 'F-L', 'M', 'N', 'O', 'P', 'R', 'S', 'T', 'V-Z'
Ferrule-terminal Resistor. A Tubular resistor. Ferrule resistors use a tab at either end of the tub for mounting, and may also be referred to as Tab-terminal resistors [example MIL-PRF-26/3E]. Resistor Manufacturers
Ferrule-terminal Resistor
Fixed Resistor. A resistor having a definite resistance value that cannot be adjusted. Resistor Manufacturers
Resistor Color Bands
Film Resistor. The film type resistor is composed of a resistive film deposited on, or inside of, an insulating cylinder or filament. Film type resistors have the best high frequency performance. The effective dc resistance for most resistance values remains fairly constant up to 100 MHz and decreases at higher frequencies. Film resistor types include; Metal Film, Carbon Film, Cermet, Metal-Oxide and others.
Fixed Film Resistor. Same as a Film Resistor but contains a network of resistors. Refer to Resistor Networks for an example schematic of different styles.
Flameproof Resistor. A resistor constructed of materials that will not ignite while under an electrical over-load. A flame-proof resistor may be constructed of a porcelain core with an element made of a Metal alloy. Also; Metal Oxide Flame Proof [MOFP]. A requirement, Non-Combustibility, Flame Retardant.
Fusible Resistor. Acts as a normal resistor under normal conditions but opens under a fault condition. Jumper Resistor: see Zero-Ohm Resistor. Similar types include a Failsafe Fusible Resistor which combines a fuse and resistor in the same package.
How a Resistor Dissipates Heat
Heat Dissipation. The manner in which a resistor gives off heat.
Hermetically Sealed Resistor. Sealed so that a resistor is gas-tight to a specific rate, normally less than 1 x 10-8 cc/sec of helium. A hermetically sealed resistor is one in which the resistance element is contained within a sealed enclosure of ceramic, glass, or metal, or combinations thereof.
Hermetically Sealed Resistor Diagram
Insulation Resistance: The dc resistance measured between all terminals connected together and the case, exterior insulation, or external hardware.
Kelvin Terminal. A four terminal fixed resistor having a very low resistance [milliohm range]. Although a Kelvin Terminal has four leads they are connector together internally to form two pairs. For each pair one lead is used as a voltage sense while the other lead is used as a current sense. Normally a Kelvin Terminal is used as a current sense resistor. [Manufacturers of Current Sense Resistor]
Lead-screw: A variable resistor that is actuated by a lead-screw. Resistors may be wire-wound or non-wirewound and may be single-turn or multiturn.
Lead-Screw Style Resistor
Load-Life Stability: The long term stability of a resistor over the life of the device, under load. The more stable the device, the less the change in resistance, the better the resistor. Resistor stability relates to a value change over time, which differers from resistor tolerance.
