See how pressure, flow, and resistance relate to one another and how they each affect the human body. Rishi is a pediatric infectious disease physician and works at Khan Academy. [11:50]

Here we draw a line on a page and use it as a variable resistor in series with a speaker. What relationship do we hear? Does it sound linear? [1:11]

A demonstration showing a current change due a load. Understand why the deflection changes when an electromagnet is attached to the circuit. [1:11]

A discussion of how resistors work in a series. [11:07]

A pencil causes a change in the deflection, similar to the effect of adding an electromagnet. Why? Watch this video as a pencil is used in a circuit as a resistor! [1:03]

Combination circuits can seem daunting at first. If you remember the rules of series and parallel circuits you'll be just fine. This video demonstrates how to make calculations about power and resistance in a mixed circuit. [10:23]

Here's a chance to see if you can combine what you know to add up resistance in series AND in parallel. Rishi is a pediatric infectious disease physician and works at Khan Academy. [3:21]

Testing if a bulb is nonohmic. [9:51]

This lesson will explain how to calculate voltage, current, and resistance in simple electric circuits. It is 1 of 4 in the series titled "Electric Circuits."

This lesson will introduce psychodynamic, psychoanalytic, and gestalt approaches to psychotherapy.

Mr. Andersen describes the relationship between voltage, current and resistance in an electric circuit. Ohm's Law is introduced through a circuit simulation.