Two conducting wires of same material, equal length and equal diameter are first
connected in series and then in parallel. Compare the equivalent resistance in two cases.
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Two conducting wires of the same material and of equal lengths and equal diameter are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be (a) 1:2. (b) 2:1.
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l1=l2
d1=d2
k1=k2
R= l/ka
SERIES :
R = R1+R2
R = L1/K1A1 + L2/K2A2
R = L/KD^2 + L/KD^2
R = 2L/KD^2
PARALLEL:
R = 1/R1 + 1/R12
R = KD^2/L + KD^2/L
R = 2KD^2/L
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