Ohm’s Law and Resistance

The design of this Memoir is to deduce strictly from a few principles, obtained chiefly by experiment, the rationale of those electrical phenomena which are produced by the mutual contact of two or more bodies, and which have been termed galvanic; its aim is attained if by means of it the variety of facts be presented as unity to the mind. — Georg Ohm (Mar 16, 1789 - Jul 6, 1854)

Ohm's law is one of the most fundamental and important laws in the fields of electricity and electronic circuits.

Originals - Ohm’s Law and Resistance starts with video-assisted learning, performing practice calculations, and then applying their learning in a virtual hands-on activity from PhET.

• Begin with Video-assisted Learning to help build background knowledge about Ohm’s Law and resistance.
• Circuit Symbols Chart: Drag and drop the images and symbols to complete this informative chart.
• Ohm's Law Triangle: Originals Graphics Animation gives students a visual representation of the mathematical relationship between voltage (V), resistance (R), and current (I) in a circuit. A visual graphic example to practice calculations.
• Ohm's Law Experiment: Originals Graphics Animation gives students a visual representation of Ohm's law experiment: when the number of cells increases, the value of current and voltage increases, and the ratio of voltage to current (Resistance) is constant. Then, plot these figures on the graph to see the mathematical relationship between current and voltage is a straight line passing through the origin. The conclusion shows that voltage is directly proportional to current. Ohm’s law is verified!
• Resistors in Series: Use Ohm’s Law to calculate total resistance (Rt) in a series circuit and come up with a conclusion.
• Resistors in Parallel: Use Ohm’s Law to calculate total resistance (Rt) in a parallel circuit and come up with a conclusion.
• Electricity Challenge: Use Ohm’s Law to determine whether the switches should be on or off.
• Circuit Construction and Testing: engage students to apply their learning in a virtual hands-on activity from PhET.

💡 PhET: founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations. PhET sims are based on extensive education research and engage students through an intuitive, game-like environment where students learn through exploration and discovery.