Ohm’s Law. Voltage, current, resistance

Do you want to discover how Ohm's Law works and why it is so important for the study of electricity and electrical circuits?

The online Ohm’s Law simulations on this page will allow you to learn in a practical way how this important law works and how it shows us the relationship between voltage, current and resistance.

Ohm’s law is a fundamental law in physics that describes the relationship between electric current, resistance and voltage in an electric circuit. It was formulated by the German physicist Georg Simon Ohm in 1827 and has become one of the fundamental concepts in the study of electricity.

Ohm’s law states that the electric current flowing through a conductor is directly proportional to the applied voltage and inversely proportional to the resistance of the conductor. Mathematically, it is expressed as I = V/R, where I is the current in amperes, V is the voltage in volts and R is the resistance in ohms.

This means that if the voltage applied to a circuit is increased, the current will also increase, as long as the resistance remains constant. Similarly, if the resistance is increased, the current will decrease, as long as the voltage remains constant.

Ohm’s law is especially useful in the design and analysis of electrical circuits. It allows you to determine the current that will flow through a given component, as well as the voltage drop that will occur across that component. It is also used to calculate the resistance needed to limit the current in a circuit, or to determine the voltage needed to obtain a desired current. In addition to its basic formulation, Ohm’s law can be applied to different components in a circuit, such as series or parallel resistors.

Ohm's Law equation


See how the form of Ohm's law equation relates to a simple circuit. Adjust the voltage and resistance and see the change in current according to Ohm's law.

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