Electric circuits come in a variety of styles. Regardless of the type, Ohm’s law can be used to find a few basic quantities. Voltage is equal to current times resistance. Also, power can be calculated by current times voltage. When circuit components are arranged one after another in a loop, this is a series circuit. When the components are arranged in separate, independent connections to the voltage source, that is a parallel connection. For more complex circuits, with multiple loops or multiple voltage sources, Kirchoff’s laws are the answer. The junction rule says that charge is conserved. The loop rule says that energy or voltage is conserved.