Circuit conditions
The following diagrams show an electrical circuit containing a battery, fuse, two switches and a globe. One switch is to enable the circuit for the globe to be opened or closed. The second switch opens or closes a circuit to bypass the globe. These diagrams are used to demonstrate the different circuit conditions as follows:
In this diagram the fuse is intact but the switch between the battery and the globe is open. The circuit is in open condition. (The switch in the bypass circuit is open.)
In this diagram the switch between the battery and the globe is closed, but the fuse is broken. The circuit is in open condition. (The switch in the bypass circuit is open.)
In this diagram the fuse is intact and the switch between the battery and the globe is closed. The circuit is in closed condition. (The switch in the bypass circuit is open.)
In this diagram the fuse is intact and the switch between the battery and the globe is closed. The switch in the bypass circuit is closed. The circuit is in shorted condition. (This would cause the fuse to blow in normal circumstances.)