Question

when resistors are connected in series and parallel, what happens to the current and voltage in the circuit

Answer 1

When resistors are connected in series,

$I=I_1=I_2=...,$

$U=U_1+U_2+...;$

when resistors are connected in parallel, 

$I=I_1+I_2+...,$

$U=U_1=U_2=...$ .