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Various resistor types of different shapes and sizes. A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.
Axial-lead resistors on tape.The component is cut from the tape during assembly and the part is inserted into the board. Size comparison of axial-lead resistors. A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element.
SMD resistors on the backside of a PCB. Pass current in proportion to voltage and oppose current. Resistor – fixed value Power resistor – larger to safely dissipate heat generated; SIP or DIP resistor network – array of resistors in one package; Variable resistor Rheostat – two-terminal variable resistor (often for high power)
Resistors (and other elements with resistance) oppose the flow of electric current; therefore, electrical energy is required to push current through the resistance. This electrical energy is dissipated, heating the resistor in the process. This is called Joule heating (after James Prescott Joule), also called ohmic heating or resistive heating.
Mnemonics are used to help memorize the electronic color codes for resistors. Mnemonics describing specific and relatable scenarios are more memorable than abstract phrases. Mnemonics describing specific and relatable scenarios are more memorable than abstract phrases.
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