video K1: Current, Drift Velocity, and Current Density

video K2: Resistivity, Resistance, and Conductivity

video K3: Resistance

video K4: Finding the External Resistor that will Yield the Maximum Power For a Battery with Internal Resistance

video K5: Bridge Circuits

video K6: Review for Unit M. DC Circuits. You might want to pause the video each time a question is asked and try to get the answer on your own.

video K7: Review for Unit M. DC Circuits (part 2)

 video K8: Review for Unit M. DC Circuits (part 3)

video K9: Review for Unit M. DC Circuits (part 4)