1) The series combination of resistors is used when the current in the circuit is to be decreased.
2) The parallel combination of resistors is used when the current in the circuit is to be increased.
3) The parallel combination of resistors is used when the resistance in the circuit is to be decreased.
4) The series combination of resistors is used when the resistance in the circuit is to be increased.
5) As voltage is directly proportional to resistance, the minimum voltage will be in the parallel combination.
5) As voltage is directly proportional to resistance, the maximum voltage will be in the series combination.