Question

2
are devices that open and close gaps in circuits.
3. Cells can be of two types, primary and​

Answer 1

Answer:

2} A switch is a simple device which breaks a circuit or completes a circuit, as desired by us. A switch works by opening and closing a gap in an electric circuit.

3} There are only two main types of cells: prokaryotic and eukaryotic. Prokaryotic cells lack a nucleus and other membrane-bound organelles.