Familiarization of Basic Components – Resistor

Objective:

How to measure the resistance values of various colour coded carbon resistors.

Theory:

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. NONAME OF APPARATUS USEDQUANTITY    MAKER’S NAME     RANGE
1Resistor
2Multimeter
3Potentiometer
4Breadboard

Observation Table:

[FOR FIXED RESISTOR]

SL.NOCOLOUR BAND OF RESISTORSCALCULATED

VALUE (Ω)

MEASURED VALUE(Ω)RANGE%ERROR=(C.V-M.V)/C.V*100WATTAGE(W)

 

  [FOR VARIABLE RESISTOR]

SL.NORESISTANCE 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)

Conclusion:

1)Each resistor has a current carrying capacity.

2)Current more than the prescribed wattage may damage the resistor.

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