# What is Ohm’s Law?

Are you intrigued by electricity? Wondering what Ohm’s Law is and how it relates to electricity? This article will discuss Ohm’s Law and the circuits and components that define electrical power.

## What is Ohm’s Law?

Ohm’s Law is one of the most basic and essential laws on electric circuits. It is a formula that calculates the relationship between voltage, current, and resistance in an electrical circuit. Ohm’s Law states, “The voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperature remain constant.” The formula is:

V = I x R or Voltage = Current x Resistance

Ohm’s Law can be used to validate values of circuit components, current levels, and voltage amounts. To verify Ohm’s Law, you will need the following:

Resistor – a passive electrical component that creates resistance in the flow of electric current. The resistance is measured in ohms. Resistors are used for generating heat, limiting electric current, and reducing voltage.

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Ammeter – used to measure alternating or direct current. The unit of current is the ampere.

Voltmeter – a device that measures the voltage between two points of an electrical circuit. The voltmeter is used for both AC and DC circuits.

Battery – a generator or storage cell that converts chemical energy within its active material into electric energy.

Plug Key – an electric component that acts as a switch to turn on the circuit.

Rheostat – a variable resistor used to control current. It can vary the resistance in a circuit without interruption.

## What is Electric Power?

Electric power, also known as electricity, is a secondary energy source generated by a primary energy source like solar, wind, or fossil fuel. Electric power is the rate at which energy is converted from an electrical charge to another form of energy stored in magnetic fields. The unit of power is the watt.

## What is the Basic Science of Circuits?

Circuits are made up of atoms. Atoms are particles that include:

Protons – subatomic particles with a positive charge found in every element’s atomic nucleus. The number of protons in an atom is determined by its atomic number on the Periodic Table of Elements.

Neutrons – subatomic particles found inside the nucleus of every atom, with hydrogen as the one exception. Neutrons have a neutral electric charge.

Electrons – negatively charged subatomic particles that can be bound to an atom or free, not bound. Electrons are not made up of smaller components.

Together, protons and electrons form an atom’s nucleus. When an atom has the same number of protons and electrons, it is neutral.

## Final Thoughts

Did learning about Ohm’s Law interest you in learning more about electricity? If so, becoming an electrician may be a promising career. Let Tulsa Welding School train you to become an electrician in our Electrical Applications program. In as little as seven months, you will be ready to start an apprenticeship in electrical applications. Contact us to learn more.