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When electronic devices are receiving power but are not running, they are in standby mode. For example, a television is in standby mode when it is plugged in, but turned off. While the TV is not on, it is ready to receive a signal from the remote control. An A/V receiver is also in standby mode when it is plugged in and turned off. This is because the receiver may be activated by receiving input from a connected device or by being turned on directly with the remote control. In other words, these devices are standing by, waiting to receive input from the user or another device.
When a computer is in standby mode, it is not completely turned off. Instead, it has already been turned on, but has gone into sleep mode. Therefore, when referring to computers, Sleep and Standby may be used synonymously. A computer in standby mode requires a small amount of current, called a trickle charge, that keeps the current state of running software saved in the computers RAM. However, because the computer is in sleep mode, the CPU, video card, and hard drive are not running. Therefore, the computer uses very little power in standby mode.
Since standby mode saves energy, it is a good idea to put your computer to sleep if you are going to be away from it for more than 15 or 20 minutes. You can also use the Power Options control panel (in Windows) or the Energy Saver System Preference (in Mac OS X) to automatically put your computer to sleep after it has been inactive for a specific amount of time. Then, when you take a break from your computer, your computer can take a break as well.
* These videos are coming directly from Youtube, they may or may not be most relevant to the word "Standby"
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