An SR Latch is a Sequential circuit(a circuit with memory) where S stands for set and R for reset.
S and R are defined with respect to a reference output Q.
Change the input of SR latch by moving the position of switches.
Inputs: Bottom left = S
Top left = R
Outputs: Blue = Q
Green = Q'
S R Q Q'
1 0 1 0
0 0 1 0 (after S=1,R=0)
0 1 0 1
0 0 0 1 (after S=0,R=1)
1 1 0 0 (forbidden)