A circuit that has resistances singly, in series, in parallel, or series parallel.
The resistance of a circuit is the total opposition offered to the flow of electric current.
lowers the amt of electrical current flowing through it.
It slows down the current. Resistance has absolutely no effect on the 'speed' of the current. It simply limits its value.
It causes a higher current in the circuit.
Your question is too broad. What is linked in series in your circuit? Resistance is never completely constant in any circuit. (Due to imperfections in the wire itself, discrepancies in its density...