OBJECTIVE: – How to measure the resistance values of various colour coded carbon resistors.
RESISTOR: A resistor is a passive bilateral electrical component that implements electrical resistance as a circuit element. It reduces current flow, at the same time. It may act to lower voltage levels within circuit.
These are three types of resistors——
1)FIXED RESISTOR: – This resistor has a fixed value and it has a defined ohmic resistance and is not adjustable. This resistor is less stable.
2)VARIABLE RESISTOR: –The resistor whose electrical resistance value can be adjusted as per requirement by adjustable component attached to it. The resistance is varied by sliding a wiper contract along a resistance track.
3)POTENTIOMETER: – A potentiometer, informally a pot, is a three-terminal resistor with a sliding or rotating contact that forms adjustable voltage divider. If only two terminals are used, one end the wiper, it acts as a variable resistor or rheostat.
STANDARD COLOUR CODE TABLE: –
APPARATUS TABLE: –
|SL. NO||NAME OF APPARATUS USED||QUANTITY||MAKER’S NAME||RANGE|
OBSERVATION TABLE: –
[FOR FIXED RESISTOR]
|SL.NO||COLOUR BAND OF RESISTORS||CALCULATED
[FOR VARIABLE RESISTOR]
|SL.NO||RESISTANCE b/w 1&2 TERMINEL(R1) (Ω)||RESISTANCE b/w 2&3 TERMINEL(R2)(Ω)||RESISTANCE b/w 2&3 TERMINEL(R3)(Ω)||%ERROR=(C.V-M.V)/C.V*100|
|CALCULATION VALUE(Ω)||MEASURED VALUE(Ω)|
1)Each resistor has a current carrying capacity.
2)Current more than the prescribed wattage may damage the resistor.