Crash Course
Crash Course Physics #29: Dc Resistors and Batteries
Batteries power much of your daily life. In this video episode of Crash Course Physics, we're going to talk about how they work. We're also explaining how terminal voltage results from the natural internal resistance of every real...
Crash Course
Crash Course Physics #30: Series and Parallel Circuit Analysis
How does Stranger Things fit in with Physics and, more specifically, circuit analysis? I'm glad you asked! In this video episode of Crash Course Physics, Shini walks us through the differences between series and parallel circuits and how...
Crash Course
Crash Course Physics #36: Ac Circuits
In this video episode of Crash Course Physics, it's time to delve into the world of AC Circuits (or Alternating Currents). We've talked about how they change voltage, which helps transmit electricity over long distances, but there's so...
Khan Academy
Khan Academy: Analyzing a Resistor Circuit With Two Batteries
An example of simplifying a seemingly complicated resistor circuit. [9:44]
Khan Academy
Khan Academy: Spout Wiring for Led Eyes
View a demonstration of how to wire LED lights for robot eyes. [10:33]
Khan Academy
Khan Academy: Variable Resistor (Pencil)
We use the inside of a pencil (graphite) to apply different 'lengths of pencil' to the circuit. What relationship do you observe between the length of graphite and deflection angle? Watch this video to find out! [1:27]
Khan Academy
Khan Academy: Pencil Resistor
A pencil causes a change in the deflection, similar to the effect of adding an electromagnet. Why? Watch this video and find out! [1:04]
Khan Academy
Khan Academy: Listen to Variable Resistance
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? Watch and find out![1:11]
Khan Academy
Khan Academy: Series Load
Why does the deflection change when an electromagnet is attached to the circuit? Does it matter what side of the electromagnet we test? Watch this video to find out. [1:11]