Switches Flashcards
What do switches do?
Switches control the flow of electrical current in a circuit by opening or closing it.
How do switches work?
By mechanically connecting or disconnecting conductive contacts, they allow or block current flow.
What are the primary types of switches?
SPST (Single Pole Single Throw)
SPDT (Single Pole Double Throw)
DPST (Double Pole Single Throw)
DPDT (Double Pole Double Throw)
What is an SPST switch?
A basic on/off switch with one input and one output.
What is an SPDT switch?
A switch with one input and two outputs, allowing the circuit to toggle between two paths.
What is a DPDT switch?
A switch that controls two separate circuits, each with two outputs.
What are the variants of switches based on operation?
Toggle, rocker, slide, pushbutton, rotary, and momentary switches.
What is a toggle switch?
A switch operated by a lever that flips between two or more positions.
What is a rocker switch?
A switch with a rocking mechanism that tilts to open or close the circuit.
What is a slide switch?
A switch that operates by sliding a knob to connect or disconnect the circuit.
What are common materials used in switches?
Plastic, metal, and conductive alloys for contacts.
What is the voltage rating of a switch?
The maximum voltage the switch can handle safely, such as 12V, 120V or 250V.
What is the current rating of a switch?
The maximum current the switch can handle, often measured in amperes (e.g., 5A, 10A).
What is a momentary switch?
A switch that returns to its original position when released, like a doorbell.
What is a maintained switch?
A switch that stays in its last position until manually changed, like a light switch.
What is a limit switch?
A mechanical switch activated by physical contact with an object, often used in industrial machines.
What is a mercury switch?
A switch that uses liquid mercury to complete or break a circuit, sensitive to orientation.
What is a DIP switch?
A set of small manual switches packaged in a dual-in-line package, used for configuring circuits.
How do you use switches in circuits?
Place them in series with the load to control the flow of current.
What is an IP-rated switch?
A switch with a specific Ingress Protection rating, indicating resistance to dust and water (e.g., IP67).
What are common applications for switches?
Lighting control, appliance operation, industrial machinery, and user interfaces.
What can go wrong with switches?
Worn contacts, corrosion, mechanical failure, or overheating due to overcurrent.
What is contact resistance in a switch?
The resistance at the contact points, which can increase with wear and affect performance.
How do you maintain a switch?
Clean contacts, avoid excessive force, and ensure proper installation to prevent damage.
What is a solid-state switch?
A switch with no moving parts, using semiconductors to control current flow.
What is a pole in switch terminology?
The number of separate circuits controlled by the switch.
What is a throw in switch terminology?
The number of positions or paths a switch can connect to.
What is a double-throw switch?
A switch that can connect a single input to one of two outputs.
What is a keylock switch?
A switch operated by a key, often used for security or restricted access.
What is a safety switch?
A switch designed to prevent accidental operation, often with a locking mechanism.
