We have just finished a unit on electricity and cirtuits. We learned about DC circuits, or direct current circuits. These circuits always have a battery, wires, and and a resistor (usually a lightbulb). They can also have a voltmeter, ammeter, different types of resistors, many batteries, and many other things to make the circuit interesting. In the diagrams below, I have examples of three types of direct current circuits: a series circuit, a parallel circuit, and a complex circuit (a combination of both).