What device is typically driven by an electric motor?

The priming device is typically driven by an electric motor because it is responsible for evacuating air from the pump casing to enable the pump to draw in water. In mobile water supply systems, maintaining prime is crucial for efficient operation, especially in situations where water needs to be moved quickly and reliably. Electric motors are widely used in these devices due to their effectiveness in providing consistent power to achieve the required suction pressure.

While other devices mentioned may have components that can be driven by electric motors, they do not primarily rely on this type of motor for their operation. For example, pressure regulators and discharge valves are more about controlling flow and pressure rather than actively moving water or air. Hydraulic pumps can also be driven by electric motors; however, they are often powered by other means, such as internal combustion engines in mobile applications.