What type of switch is represented by item 3 in figure T2?
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Correct AnswerSingle-pole single-throw
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Single-pole double-throw
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Double-pole single-throw
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Double-pole double-throw
Single-pole means that there is a single set of contacts that are connected or disconnected with the switch. Note on the diagram that there is only a single line into the switch and a single line out. Double-pole would mean that the switch could connect or disconnect two wires at once and there would be two contacts going into the switch on the diagram.
Single-throw means that there is only one "choice" for each of those contacts; with a double-throw the switch would connect the input to one of two outputs. Triple-throw would be one of three outputs, etc
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What is the function of component 2 in Figure T1?
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Give off light when current flows through it
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Supply electrical energy
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Correct AnswerControl the flow of current
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Convert electrical energy into radio waves
Figure 2 is an NPN-type bipolar junction transistor (the arrow points out, "Not Pointing IN"). Transistors (most commonly PNP or NPN type) have three terminals; two of them are part of one circuit, and the third (the one coming directly into the line) is a control input. Depending on what kind of transistor it is, applying current there will either allow current to flow across the other two legs or will restrict current from flowing.
Transistors definitely do not give off light; that's the Lamp, which is component #3. Component 4, a battery, supplies electrical energy, and nothing in this circuit converts electrical energy into radio waves.
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