# Ohm's Law Lesson for Kids: Definition & History

Instructor: Michelle Jones

Michelle has taught at the elementary level and has earned a master's degree.

This lesson discusses the history and definition of Ohm's Law, which is used to figure out the three major parts of electricity: voltage, current, and resistance.

## Ohm's Law

What happens when you make a scientific discovery? You get a law named after you!

Voltage, current, and resistance are all parts of electricity that affect each other. A scientist named Georg Ohm figured out how these three things are related and came up with a formula known as Ohm's Law.

## History of Ohm's Law

Like many scientists, Ohm expanded on work done by other scientists who came before him. From 1825 to 1827, he did many experiments and came up with the formula that explains the relationship among voltage, current, and resistance that became very important in the study of electrical circuits. At the time, scientists did not agree with or accept this formula. However, many years later, they realized the value in Ohm's findings, and Ohm's Law became very well-known.

## What is Ohm's Law?

Before we get into the actual formula, let's discuss the three parts of the formula. Voltage, labeled with a (V), is the force of an electrical current at the end of its path. This is measured in volts. For example, a 12-volt car battery has more force than a 3-volt watch battery. Current, labeled with an (I), is how fast or slow electricity travels in a certain amount of time. This is measured in amps. Resistance, labeled with an (R), is how the path of electricity resists or fights the flow of electricity. This is measured in ohms. For example, a wide water hose has less resistance than a narrow water hose.

Ohm's Law shows how voltage, current, and resistance are related.

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