Khan Academy: Adding Up Resistance in Series and in Parallel

Emerging electricians extend mental models of light bulbs and resistors in series and or in parallel circuits to include the connection of photovoltaic cells in arrays. They investigate open circuits, using a DC voltmeter, a light...

Physics learners experiment with three laboratory activities to learn about air resistance and friction. First, they use a hair dryer to move different sized spheres to determine the relationship between cross-sectional area and air...

Investigate trends in common oxidation states for main group elements with this video. [8:34]

An explanation to prove the volume ratios in a Carnot cycle. [17:08]

Video tutorial defines and explains oxidation and reduction in cellular respiration in both biology and chemistry. [17:08]

Learn how the size of a tube (it's radius) is related to its resistance to something flowing through. Rishi is a pediatric infectious disease physician and works at Khan Academy. [8:53]

Sal will illustrate how to balance redox reactions in acid. [11:58]

Understand how to balance a redox reaction in a base. [13:57]

Practice for the MCAT with these questions pertaining to current and resistance.

Learn the basics of circuits with this video. Video will define current and resistance to explain how electrons flow to create electricity. [11:39]