Devices {switch, machine}| can turn current or voltage off or on.
types
Metal blade can slide into metal holder {knife switch}. Spring can make switch {snap action switch} stay in one position or the other. Snap switches can use a metal disc, which snaps from concave to convex. Half-filled tube of mercury liquid {mercury switch} can move from horizontal and closed to vertical and open. Switches can control one circuit {two-pole switch} or several circuits {multipole switch}.
circuit
Switches on stairs use a parallel circuit, and two different electrical paths can make switch be on.
safety
Perhaps, switches can be safe even when immersed. Such switches can be good in most appliances. Bakelite or other heat and current resistant, moldable material seals switch metal contacts. Wires to and from switch have watertight holders. Magnetism closes and opens switch, by moving throw inside Bakelite.
Switches can have locks to prevent young children from moving them.
Switches {relay}| can use a solenoid to open and close.
Switches {toggle switch}| can have levers.
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Date Modified: 2022.0225