Enter your voltage (V) and electrical charge (C) to calculate the energy in joules — plus bonus conversions to kilowatt-hours and calories so you can see exactly how much electrical energy you're working with.
Energy
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Energy (kWh)
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Energy (calories)
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The formula is E(J) = V(V) × Q(C), where E is energy in joules, V is voltage in volts, and Q is electrical charge in coulombs. This formula shows that energy is directly proportional to both voltage and charge.
Volts measure electrical potential difference or voltage, while joules measure energy. Volts indicate the force that pushes electrical current, whereas joules quantify the actual amount of energy stored or transferred in an electrical system.
Using the formula E(J) = V(V) × Q(C), multiply 12 volts by 4 coulombs to get 48 joules. This means a charge of 4 coulombs at 12 volts contains 48 joules of energy.
A coulomb (C) is the unit of electrical charge. It represents the amount of electric charge carried by a current of one ampere flowing for one second. One coulomb equals approximately 6.242 × 10^18 elementary charges.
Yes, you can convert joules back to volts if you know the charge. The formula is V(V) = E(J) ÷ Q(C). You need both the energy in joules and the charge in coulombs to determine the voltage.
This conversion is essential in electrical engineering, battery capacity calculations, capacitor energy storage, lightning energy analysis, and power system design. It helps determine energy storage and consumption in electrical circuits.
Theoretically, there's no upper limit, but practically, values depend on your specific application. This calculator accepts values up to 99,999,999 for both voltage and charge, covering most real-world electrical calculations.
The calculator uses the standard physics formula E(J) = V(V) × Q(C) and provides results with decimal precision. The accuracy depends on the precision of your input values and is suitable for most engineering and educational purposes.