They might be a standard, static resistor, a pack of resistors, or a special variable resistor. They might be through-hole or surface-mount. Resistors come in a variety of shapes and sizes. When modeled on a schematic, a resistor will show up as one of these two symbols: Schematic symbolĪll resistors have two terminals, one connection on each end of the resistor. For example, a 4,700Ω resistor is equivalent to a 4.7kΩ resistor, and a 5,600,000Ω resistor can be written as 5,600kΩ or (more commonly as) 5.6MΩ. It's very common to see resistors in the kilohm (kΩ) and megaohm (MΩ) range (much less common to see miliohm (mΩ) resistors). The (somewhat roundabout) definition of 1Ω is the resistance between two points where 1 volt (1V) of applied potential energy will push 1 ampere (1A) of current.Īs SI units go, larger or smaller values of ohms can be matched with a prefix like kilo-, mega-, or giga-, to make large values easier to read. The symbol for an ohm is the greek capital-omega: Ω.
The electrical resistance of a resistor is measured in ohms. Commonly resistors are used to limit current, divide voltages, and pull-up I/O lines. Resistors are usually added to circuits where they complement active components like op-amps, microcontrollers, and other integrated circuits.
They are passive components, meaning they only consume power (and can't generate it).
The resistor's resistance limits the flow of electrons through a circuit. Resistors are electronic components which have a specific, never-changing electrical resistance.
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