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For example, a 10 ohm resistor connected in parallel with a 5 ohm resistor and a 15 ohm resistor produces 1 / 1/10 + 1/5 + 1/15 ohms of resistance, or 30 / 11 = 2.727 ohms. A resistor network that is a combination of parallel and series connections can be broken up into smaller parts that are either one or the other.
In electronic logic circuits, a pull-up resistor ( PU) or pull-down resistor ( PD) is a resistor used to ensure a known state for a signal. [ 1] It is typically used in combination with components such as switches and transistors, which physically interrupt the connection of subsequent components to ground or to V CC.
A potentiometer is a three- terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. [ 1] If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat . The measuring instrument called a potentiometer is essentially a voltage divider used for measuring electric potential ...
A legal ohm, a reproducible standard, was defined by the international conference of electricians at Paris in 1884 as the resistance of a mercury column of specified weight and 106 cm long; this was a compromise value between the B. A. unit (equivalent to 104.7 cm), the Siemens unit (100 cm by definition), and the CGS unit. [13]
The resistivity can be expressed using the SI unit ohm metre (Ω⋅m) — i.e. ohms multiplied by square metres (for the cross-sectional area) then divided by metres (for the length). Both resistance and resistivity describe how difficult it is to make electrical current flow through a material, but unlike resistance, resistivity is an ...
The Steinhart–Hart equation is a model relating the varying electrical resistance of a semiconductor to its varying temperatures. The equation is. where. T {\displaystyle T} is the temperature (in kelvins ), R {\displaystyle R} is the resistance at. T {\displaystyle T} (in ohms),
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