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In domestic devices, energy is transferred from the batteries or ac mains to the energy of motors and heating devices.

Switches

One-way switch

This type of switch is used to switch a light from just one place e.g. beside a door.

The switch operates as a make or break switch, because:

• when it is turned on, the two terminals are connected and current flows;
• when it is turned off, the contact between the two terminals is broken and current does not flow.