An electric starter motor for an internal combustion engine is typically powered by which voltage?

The typical voltage used to power an electric starter motor in an internal combustion engine is 12 volts DC. This standard has been widely adopted in the automotive industry for many years due to several factors, including efficiency, reliability, and the balance between starter power demand and battery weight.

A 12-volt system provides adequate power to crank the engine while ensuring that the battery is not excessively large or heavy, making it practical for vehicle design. Most vehicles utilize a 12-volt lead-acid battery, which offers a good compromise between performance and size, allowing for sufficient cranking power and starting reliability in a variety of operating conditions.

While other voltages are used in specific applications—such as 6 volts in older vehicles, 24 volts in larger vehicles like trucks and buses for heavier starter motors, and 48 volts in some hybrid systems—12 volts is the standard for most passenger cars and light trucks. This is why the correct answer prominently reflects the common practice in engine starting systems.