| http://www.w3.org/ns/prov#value | - As shown, the power source 31 may include a battery 41, and the power controller 33 may include a switch 51 (such as a p-channel MOSFET) coupled between the battery 41 and the load, and a switch 53 (such as an n-channel MOSFET) coupled between the load and a reference voltage such as the system ground.
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