Question
What is the function of an SPDT switch?
Answer Options
- A) A single circuit is opened or closed
- B) Two circuits are opened or closed
- C) A single circuit is switched between one of two other circuits
- D) Two circuits are each switched between one of two other circuits
Correct Answer: C
Explanation
Switch abbreviations describe their internal structure. SPDT stands for Single-Pole, Double-Throw.
- Single-Pole means the switch controls only one circuit (it has one input line).
- Double-Throw means the switch can connect that single circuit to one of two different output lines (it can “throw” the signal to two different places).
Therefore, an SPDT switch is used when a single circuit is switched between one of two other circuits. An example is a simple antenna switch that connects a single radio to one of two different antennas.
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