Joules to Volts Calculator

Created by Wei Bin Loo
Reviewed by Steven Wooding
Last updated: Jan 18, 2024


With this joules to volts calculator, we aim to help you to convert energy into voltage.

We have written this article to help you understand the definitions of energy, electric charge, and voltage and how to convert joules to volts. We will also demonstrate some examples to help you understand the joules to volts calculation.

What is energy?

Energy is the ability to do work. When work is done, it is transferred from one substance to another in different forms. For example, when a ball is dropping, its gravitational energy is transformed into kinetic energy. You can use our kinetic energy calculator and potential energy calculator to understand more about this topic.

The thing to note about energy is that it is indestructible. According to the law of conservation of energy, energy cannot be destroyed or created, but it can be converted into different forms.

What is electric charge?

Electric charge is the property of a substance that causes it to experience a force when it is being placed in an electric or magnetic field. There are 2 different electric charges, i.e., positive and negative. In the subatomic world, the electrons carry negative electric charges while the protons carry positive charges. You can check out our electric field calculator to understand more on this topic.

What is voltage?

Voltage is the electric pressure that pushes electric charges in a certain direction. It is also known as electric pressure, electric tension, or potential difference. The electric charge will flow from one point that has a higher voltage to another point that has a lower voltage.

Now, let's look at the joules to volts calculation.

How to convert joules to volts?

To understand the joules to volts calculation, let's take the following information as an example:

  • Problem: Convert energy to electric charge.
  • Energy: 1,000 J.
  • Electric charge: 10 C.

You can convert joules to volts in three steps:

  1. Determine the energy in joules.

    The first step is to determine the energy in joules. For this example, it will be 1,000 J.

  2. Determine the electric charge in coulombs.

    The next step is to determine the electric charge in coulombs. In this problem that we are solving, it will be 10 C.

  3. Convert it to voltage in V by dividing the energy by charge.

    Now, we can convert joules to volts using the following formula:

    voltage = energy / electric charge

    Hence, an energy of 1,000 J is equivalent to 1,000 J / 10 C = 100 V.

FAQ

Is it possible to have negative energy?

Yes, theoretically speaking, it is possible to have negative energy. Having said that, this concept is extremely complex and is mostly used in fields such as quantum physics.

Is it possible to have negative voltage?

Yes, it is possible to have negative voltage. When the positive voltage signifies one direction of the flow of electrons, the negative voltage signifies the opposite direction.

How do I convert joules to volts?

You can convert joules to volts in three steps:

  1. Determine the energy in joules.
  2. Determine the charge in coulombs.
  3. Convert joules to voltage in V by dividing the energy by charge.

What is the voltage when there is 1,000 J with 10 C?

The voltage will be 100 V. This can be calculated by dividing the energy in joules by the charge in coulombs:

voltage = energy / charge.

Wei Bin Loo
Joules
J
Coulombs
C
Volts
V
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