Final answer:
To save energy, setting your laptop to Sleep mode is most effective. This mode reduces power consumption while allowing quick resume of activity. Emphasizing energy efficiency and reducing power or operating time of devices are key strategies to conserve energy.
Step-by-step explanation:
To save energy, you can set your laptop computer to several different power-saving states. The options given are 1) Sleep mode, 2) Hibernate mode, 3) Standby mode, and 4) Power off mode. The most accurate answer to the question would be Sleep mode. When you put your computer to sleep, it enters a low-power state that allows you to resume your work quickly while consuming less electricity compared to when it is fully on.
Understanding that energy consumed is the product of power and time, it becomes clear why reducing the power or time that a device is in full operation helps save energy. For example, limiting the use of high-power devices that operate for extended periods, such as water heaters or air conditioners, can be more cost-effective than turning off low-power devices, like electric clocks, that are in constant operation.
The concept of energy efficiency also comes into play, where using devices that accomplish tasks with less power without compromising performance—such as replacing incandescent bulbs with compact fluorescent light bulbs—also contributes to energy conservation.