Circuit board manufacture. View of forceps holding a resistor above the circuit board to which it is to be attached. The coloured bands around the resistor are a code which shows its resistive value. Circuit boards connect components, including microchips, transistors, diodes, resistors, capacitors and inductors. Circuit boards have uses in a variety of electronic products, including computers. This circuit board, when finished, will be the motherboard of a computer. Motherboards are the central processing areas of computers, and are attached to most of the other systems.