Ohm’s Law

Grades 6th-8th

NGSS: MS-PS2-3: Ask questions about data to determine the factors that affect the strength of electric and magnetic forces.


  • Students will understand the electrical quantities of and the relationship between current, voltage, and resistance in order to understand Ohm’s Law.
  • Calculate the electric current, voltage and resistance of basic electric circuits.


Lesson Introduction:

Electrical circuits are everywhere in our lives, from very complex ones that control computers and smart phones, to the simpler circuits that allow you to switch a lightbulb on and off.

In order to understand how circuits work, we have to understand Ohm’s law, which explains the relationships between the key concepts in a circuit.