# 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. NO NAME OF APPARATUS USED QUANTITY MAKER’S NAME RANGE 1 Resistor 2 Multimeter 3 Potentiometer 4 Breadboard

Observation Table:

[FOR FIXED RESISTOR]

 SL.NO COLOUR BAND OF RESISTORS CALCULATEDVALUE (Ω) MEASURED VALUE(Ω) RANGE %ERROR=(C.V-M.V)/C.V*100 WATTAGE(W)

[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)

Conclusion:

1)Each resistor has a current carrying capacity.

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

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