Fuse: A conductor link with a relatively low melting point. The link will melt when excess current overheats the fuse and will break the circuit.
Series Components connected in series are connected along a single path, so the same current flows through all of the components.current Parallel Components connected in parallel are connected so that each one has its own pathway of current
If any one of the devices fails, the interrupted circuit will cause the current to stop flowing and none of the devices will operate. (any examples?) Because each device uses up some of the potential energy, the voltage is divided among all of the devices.