Series grouping
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(i) Same current flows through each resistance but potential difference distributes in the ratio of resistance i.e. V∝R
(ii) Req = R1+R2+R3 equivalent resistance is greater than the maximum value of resistance in the combination.
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(iii) If n identical resistance are connected in series Req =nR and potential difference across each resistance V′=V/n
Parallel grouping
(i) Same potential difference appeared across each resistance but current distributes in the reverse ratio of their resistance i.e i∝1/R.
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(ii) Equivalent resistance is provided by 
or 
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Equivalent resistance is lower than the minimum value of resistance in the combination.
(iii) If two resistance in parallel 
(iv) Current through any resistance, i′= i* [Resistance of opposite branch/total resistance]
Where i' = needed current (branch current),
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i = main current
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(v) In n similar resistance are interconnected in parallel Req = R/n and current through each resistance
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