Question

Derive the expression for equivalent resistance when three resistances are connected in series with each other.
a) R₁ + R₂ + R₃
b) R₁R₂R₃
c) 1/R₁ + 1/R₂ + 1/R₃
d) R₁R₂/R₁ + R₂R₃/R₂ + R₁R₃/R₃