Now, attach one end of a 220 Ω resistor to the cathode of LED A. (Resistors behave the same way regardless of their orientation.) The other end of the resistor should be placed so that it connects to the ground bus strip. This can be done by placing the end of the resistor directly into the bus strip. Alternatively, as shown in Fig. 2, you can insert the other end of the resistor into a different column (or node) in the breadboard and then use a wire to connect from that column to the ground bus strip.