What are the names of the components (each shown with a leader and a line) of a circuit shown in the diagram?

The name of the components of the given labelled circuit is:

The box like figure in the given image is the battery source from where the current drawn into the circuit.

A string connecting positive terminal of battery to the bulb is an electric wire through which current flows in the circuit.

A bubble like object in the circuit is a bulb which lights up when current moves through the circuit.

A component connected to the negative terminal of batter source is a switch.

Then open circuit is an open as the key of the switch is open.