Abstract: A monitored and high-efficiency power supply for a motherboard includes an AC-to-DC conversion circuit, a control circuit, a standby circuit, a main output circuit, a standby output circuit. The AC-to-DC conversion circuit converts an AC source voltage to a DC voltage. When the power supply is in a standby state, the standby circuit is enabled but when the power supply is in a normal working state, the standby circuit is disabled, and the control circuit is enabled to control only the main voltage output to the motherboard. A method for supplying power to a motherboard is also provided.

Abstract: A water level detection device includes a case, a detection assembly, and a latching ring secured to the case. The detection assembly includes a warning module, a micro switch, a cable, and a floater. The cable is inserted through the latching ring and divided to a first section connected to the micro switch and a second section connected to the floater. When a water level is in an upper limit or a lower limit, the second section is tight, and an angle is defined between the second section and the first section. When the water level is between the upper and the lower limit, the second section is loose. When the water level is over the upper limit or under the lower limit, the floater pulls the first section via the second section to trigger the micro switch to alarm the warning module.