GradeGen

A component that opens or closes a conducting path in a circuit.

Notice the small details that distinguish similar-looking symbols. It shows an open switch; the complete circuit later shows its closed form.

A device that opens or closes a conducting path in a circuit.

An open switch leaves a gap in that route; a closed switch completes the connection.

A component that opens or closes a circuit so that current is stopped or allowed to flow.

A component that opens or closes a conducting path to stop or allow current.

A switch controls whether there is a gap in a path. In the open-switch symbol the contacts do not meet, so that path is broken. In the closed-switch symbol the contacts meet, so the path is conducting.

Check whether a switch is open or closed: a gap in the only loop means there is no complete path.

When explaining the position of a switch or fuse, state what happens if it is placed in the neutral wire: current may stop, but the appliance remains connected to the live supply.