Analyzing voltage and current in a circuit is a great place to start to understand what that circuit is doing. In this episode of “Adventures in Science,” we introduce the resistor and use it to help demonstrate Ohm’s Law.
This interesting law of physics was named after Georg Ohm, and states that the current between two points is directly proportional to the voltage across those two points: I = V/R
With a little bit of algebra, we can move the variables around and arrive at the more memorable: V = I x R
In the video, we demonstrate voltage and current in a fluid-based circuit, and show how a resistor acts like a piece of steel wool used to restrict the flow of water. We also construct a real circuit using a resistor, measure the voltage and current, and then calculate the resistance using Ohm’s Law.