180 k ohm 1/4 watt resistor (10 pieces) pack is a passive two-terminal electrical component that implements electrical resistance as a circuit element. Resistors act to reduce current flow, and, at the same time, act to lower voltage levels within circuits.
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Definitions and Calculations
Resistor and Resistance
A resistor is a passive electrical component that creates electrical resistance in electronic circuits.. The list is endless.
The electrical resistance of a resistor or an electrical conductor is a measure of the opposition to the flow of electric current. The SI unit for resistance is the ohm. Any material shows some resistance except superconductors, which have zero resistance. More information about resistance, resistivity and conductance.
Of course, it is possible to make a resistor with very precise resistance, however, it will be insanely expensive. Besides, high precision resistors are relatively rarely used. There are very expensive resistors used for measurements. Here we will talk about inexpensive resistors used in electric circuits, which do not require high precision. In many cases, ±20% of precision is enough. For a 1 kilohm resistor, this means that any resistor with a value in the range of 800 ohms to 1200 ohms is acceptable. For some critical components, the tolerance can be specified as ±1% or even ±0.05%. At the same time, it is hard to find 20% resistors today — they were common at the beginning of the transistor radio era. 5% and 1% resistors are very common today. They were relatively expensive in the past, but not anymore.
And not only its temperature but also the temperature of components surrounding this resistor.
where V in volts is the voltage across the resistor of resistance R in ohms and I is the current in amps flowing through it.Generally, the larger the resistor package, the more power it can dissipate.
Although it is possible to produce resistors of any value, it is more useful to make a limited number of components, especially considering that any manufactured resistor is subject to a certain tolerance. More precision resistor’s costs are much higher than their less precise counterparts. For example, for a tolerance of ±10%, it makes sense to cover a decade (the interval from 1 to 10, 10 to 100, etc.) in 12 steps: 1.0, 1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 3.9, 4.7, 5.6, 6.8, 8.2, then 10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, 82 Each E-series (E3, E6, E12, E24, E48, E96, and E192) subdivides a decade into 3, 6, 12, 24, 48, 96 and 192 steps.