If it looks like there is an open door, the circuit is open, and the electricity is off. If the drawing looks like the door is closed, the circuit is closed, and the electricity is on. Removing the charge on an object by redirecting the current to the earth is known as grounding the object. A metal wire or pole acts as a ground for every building. If lightening strikes the building, a lot of the electricity may be carried directly into the earth by the ground wire.
Power is the amount of work done in a certain amount of time.
1000 watts is known as a kilowatt.