Resistive Circuits
Micro-model of Charge Flow, Resistance, Ohm's Law, Power
Check out Crash Course Physics's introduction to electrical current.
Kirchoff's Laws
Circuits exist in lots of everday items, from cell phones, to computers, to cars, to toasters. Anything that requires electricity to operate, has some form of circuit. Here we study circuits that have constant voltage sources, like a battery, and resistive elements, like a lightbulb.
Equivalent Circuits
Check out this short animation of simplifying a circuit.