What voltage batteries do typical electrical system engines commonly use?

The typical electrical systems in most engines, especially in automotive and larger vehicle applications, commonly use 12 or 24 volts. The 12-volt system is standard in passenger vehicles, providing the necessary power to start the engine and operate various electrical components. For larger vehicles, such as trucks and some heavy equipment, a 24-volt system is often employed, which supports higher power demands and improves efficiency for larger loads.

The 12-volt system is sufficient for the electrical loads of most passenger cars, including lights, ignition systems, and other accessories. On the other hand, the 24-volt system is advantageous for heavier applications, as it can deliver more power with less current. This leads to reduced wire sizes and improved efficiency, which is crucial in commercial vehicles that require more energy for operations such as starting larger engines and powering additional accessories.

Batteries with other voltages, such as those found in the other options, are less common in standard automotive and engine applications. For instance, while 48-volt systems are gaining traction in some hybrid and electric vehicles for specific applications, they are not the norm for traditional internal combustion engines. Consequently, the correct answer reflects the most commonly encountered voltage levels in typical engine electrical systems.