Convert coulombs to volts with V = E/Q: enter the energy in joules and the charge in coulombs, or solve for coulombs, joules (C × V) or capacitor voltage.
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Coulombs To Volts Formula
The following formula is used to calculate the electric potential in volts from the electric charge in coulombs and energy in joules.
Variables:
- V is the electric potential in volts (V)
- E is the energy in joules (J)
- Q is the electric charge in coulombs (C)
For the constant-potential energy-transfer model, divide signed energy in joules by nonzero charge in coulombs: V = E/Q. Charge alone cannot determine voltage. For an ideal capacitor, use Q = CV and V = Q/C with positive capacitance; its stored energy is U = ½QV, rather than QV.
For the voltage at a distance from a point charge, including charges in microcoulombs (µC) or nanocoulombs (nC), use the Potential Difference Calculator’s point-charge potential mode. It uses V = kQ/r in a vacuum, with distance r measured from the charge and zero potential at infinity. Charge alone still does not determine voltage.
| Electric Charge (C) | Electric Potential (V) |
|---|---|
| 0.0005 | 2000.000 |
| 0.0010 | 1000.000 |
| 0.0020 | 500.000 |
| 0.0050 | 200.000 |
| 0.0100 | 100.000 |
| 0.0200 | 50.000 |
| 0.0500 | 20.000 |
| 0.1000 | 10.000 |
| 0.2000 | 5.000 |
| 0.5000 | 2.000 |
| 0.7500 | 1.333 |
| 1.0000 | 1.000 |
| 1.5000 | 0.667 |
| 2.0000 | 0.500 |
| 3.0000 | 0.333 |
| 4.0000 | 0.250 |
| 5.0000 | 0.200 |
| 7.5000 | 0.133 |
| 10.0000 | 0.100 |
| 20.0000 | 0.050 |
| * Rounded to 3 decimals. Uses V = E ÷ Q with E = 1 J. Note: for fixed energy, voltage is inversely proportional to charge. | |
What is Coulombs To Volts?
Coulombs and volts are two different units used in the field of physics, specifically in electricity. Coulombs are a unit of electric charge, while volts are a unit of electric potential or electromotive force. There isn’t a direct conversion from coulombs to volts because they measure different things. However, they are related through the concept of electric potential energy, where one volt is defined as one joule (unit of energy) per coulomb. This means that if one coulomb of charge gains or loses one joule of energy, it has moved through a potential difference of one volt.
How to Calculate Coulombs To Volts?
The following steps outline how to calculate the Coulombs To Volts using the formula: V = E / Q.
- First, determine the energy in joules (E).
- Next, determine the electric charge in coulombs (Q).
- Next, gather the formula from above: V = E / Q.
- Finally, calculate the electric potential in volts (V).
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem:
Use the following variables as an example problem to test your knowledge.
energy in joules (E) = 150
electric charge in coulombs (Q) = 25
