In electricity, energized at all times means that the circuit remains energized all the time, while current flows all the time. This state is very common, for example, the light bulb or charger that is energized in your room works in the always energized state. In this state, the power source in the circuit is always providing electrical energy, thus keeping the circuit energized.
The ready-to-energize state is important for critical equipment and circuits, such as medical devices, computers, and control systems. These devices need to be kept in an efficient and accurate operating condition. If these equipments are shut down unexpectedly, it is likely to lead to significant damage or affect the life safety of personnel. Therefore, it is very important to keep power on at all times in these devices.
To maintain a powered-on condition at all times, a reliable power source and stable voltage are required. To achieve this goal, we usually use equipment such as backup power, voltage regulators, UPS and batteries to ensure the stability and continuity of power supply. In addition, for some critical circuits, it is necessary to design some reliable automatic switching circuits to ensure that the circuit can continue to work even when the power supply fails.