How much electricity does a motion sensor use?

A motion sensor typically consumes very little electricity, often in the range of 0.5 to 2 watts when active. Many modern motion sensors are designed to be energy-efficient and may enter a low-power sleep mode when not in use, further reducing their energy consumption. Overall, the annual energy usage of a motion sensor is generally quite minimal, especially compared to the devices they control, such as lights or alarms.