Here you go:
Slip Rings - are used to maintain contact with the coils in an AC Generator. They are used instead of connecting the wires directly to the coils to prevent tangling as the coil spins. Thus, the slip rings act merely as connections to the coils, connecting the coils to the circuit like a simple wire would.
Split Ring Commutators - change the current direction every half cycle, hence they are used in DC motors to change the direction of the force couples every half cycle, causing the motor to rotate in one direction. In electricity generation, they are used to reverse half of an AC signal, hence, acting like a bridge rectifier and producing unsmooth DC Voltage.