Question

deduce the expression for the equivalent resistance for the series combination of 2 resistances R1 and R2 . (please explain briefly )​

Answer 1

The Resistors connected in Series Combination always gets added up.

So, If two resistors r1 and r2 are connected in series combination,

Therefore, the equivalent resistance becomes

$r_{eq} = r_{1} + r_{2}$

Similarly if Rn resistors(of same resistance) are connected in series then the Equivalent resistance becomes -

Req = (R+R+.....+n times) = n.R.