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Three resistance of 2ohm,3ohm,5ohm are connected …

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Three resistance of 2ohm,3ohm,5ohm are connected in the electric circuit. Calculate the (a) maximum effective resistance (b) minimum effective resistance.

Posted by Pooja Kumari ?????? 5 years, 8 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 8 months ago

the maximum resistance can be found by adding all the resistance that is placing them in series
so Rs=R1+R2+R3=2+3+5=10ohm

minimum effective resistance is obtained if we make parallel combinations
so 1/Rp=1/R1+1/R2+1/R3=1/2+1/3+1/5=6/5
so Rp=5/6=0.83ohm
now if we can keep two of the larger resistors in parallel and the smaller in series
1/Rp=1/R2+1/R3=1/3+1/5=16/30
so Rp=30/16=1.875ohm
now in series
Rs=R1+1.875 ohm =2+1.875=3.875 ohm

1Thank You

Satyam Gupta 5 years, 8 months ago

(a)5ohm (b)2ohm

2Thank You

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CBSE > Class 10 > Science