Resistors are components in electronic circuits that limit curent. 1K2 is a 1.2 Kilo ohm resistor. To say "what does it do" is too general a question. Suffice it to say that they are ubiquitous items that have many uses in electronics generally limiting current with effects on voltage when used properly in pairs or with resistive loads.
Ted
yes, a variable resistor
Otis F. Boykin invented the wire precision resistor and the electrical resistor.
Resistor value is defined by the Resistance the resistor offers in Kilo ohms/ohms value given by color codes on the resistor.
The purpose of colored bands on a resistor is to tell whoever is installing the resistor the amount of resistance that particuliar resistor has.
A cement resistor is typically used as a power resistor (a resistor whose power rating is greater than 1 W).
A non-ohmic resistor doesn't have a constant resistance. A ohmic resistor has a constant resistance.
The alternator does not have a resistor.The alternator does not have a resistor.
It does not have a ballast resistor.It does not have a ballast resistor.
A series dropping resistor is a resistor that limits the amount of current flow in a circuit.
The Cable is the Resistor ! Its a Resistor-Cable ! Greets from the Lake of Constance/Germany !
Where would you find a material which is a resistor? You can find a resistor material in Europe
The first 3 band on a resistor indicate the value of that resistor.