In electricity, electrical energy (usually measured in joules) can be calculated from voltage (volts), current (amperes), and time (seconds). However, direct conversion from volts to joules requires knowledge of the time it takes for the current to pass, because electrical energy (E) is the product of voltage (V), current (I), and time (t).

Suppose there is a circuit with a voltage of 12 volts (V) and a current of 2 amperes (A), and this current lasts for 5 seconds (s). We can use the above equation to calculate the amount of power consumed in this process:

E(J) = 12V x 2A x 5s = 120J

Therefore, this circuit consumed 120 Joules of electrical energy in 5 seconds.

• System Design: When designing a solar power system, engineers may need to estimate the electrical energy output of the system under different conditions. By assuming an average current and operating time, they can use the volt to joule conversion to estimate the total electrical energy generated by the system.
• Performance Evaluation: When evaluating the performance of a solar power system, it is critical to know the electrical energy output of the system under different lighting conditions. By measuring voltage, current and operating time, the total electrical energy generated by the system can be calculated and compared to the design target.
• Cost-benefit Analysis: Before deciding to invest in a solar power system, investors need to understand the long-term payback of the system. By calculating the amount of electricity (in joules) the system produces over time and converting it to kilowatt-hours (kWh, a more common unit of electrical energy), the system's electrical output and potential cost savings can be estimated.

• Joules to watts calculator
• Volts to amps calculator
• Volts to watts calculator
• Solar Panel Installation Cost Calculator
• Solar Power ROI Calculator