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Standby power, also called vampire power, phantom load, or leaking electricity, refers to the electric power consumed by electronic appliances while they are switched off or in a standby mode. A very common "electricity vampire" is a power adapter which has no power-off switch. While this consumption of power may be used to provide useful functions for appliances such as remote controls and digital clocks to the user, most power consumed by non-operational devices is considered wasted.

Devices and functions that consume standby power  Read more... (957 words, 10 images, estimated 3:50 mins reading time)

• Power supplies, transformers and inefficient electronic devices, for example battery chargers. Those constantly generate heat that can't be further used.
• "Instant on" functions, like remote control receivers, waiting for the user to interact.