Find resistance of two resistors series and parallel, std 8 to 12 GSEB

Effective resistance of two resistor practical

To find effective resistance of two resistors connected in (1) Series (2) Parallel connection.

(ohm’s Law)

AIM : To find effective resistance of two resistors connected in (1) Series (2) Parallel connection.

PRINCIPLE  :  When two resistors are connected in series effective resistance is equal to the sum of their resistance. When two resistors are connected in parallel connection reciprocal of effective resistance is equal to the sum of reciprocal of the resistance.

APPARATUS  :   Ammeter ( 0 – 500 mA), Voltmeter ( 0 -10 V ),  Battery eliminator ( 0 – 12 V), Two unknown  resistors, Plug-key, rheostat, wires,

Find Resistance of Resistor Practical

Find Resistance of Resistor Practical

SERIES CONNECTION

Find Resistance of Resistor Practical

PARALLEL CONNECTION

Find Resistance of Resistor Practical

Observation table of Resistor practical

CONCLUSION

(1) Average value of resistance  R₁ =             W          

(2) Average value of resistance  R₂ =         W

(3) Average value of effective resistance in series connection R₃ =     W

(4) Average value of effective resistance in parallel connection R₄ =     W        

Note : Verify :    (1) R₃ = R₁ + R₂ for series connection.

                               (2) 1/ R₄ = 1/ R₁ + 1/R₂ for parallel connection

PRACTICAL USES

Many times resistance are connected in series e.g. series of small bulbs used for decoration. Domestic connections are always in parallel, e.g. bulbs, tube-light, t.v., fridge. Etc.