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Switches
18 questions By Tony R. Kuphaldt
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Question 4 of 18
Does this switch (in the closed state) have a low resistance or a high resistance between its terminals?
Reveal answerA closed switch is supposed to have low resistance between its terminals.
Notes:Ask the students what it would mean if a closed switch actually measured having high resistance between its terminals. Knowing what the measurements of any electrical component ought to be is a very important skill for troubleshooting.
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Question 5 of 18
How might you use a meter (or a conductivity/continuity tester) to determine whether this electrical switch is in the open or closed state?
Reveal answerMost multimeters have a “resistance” measurement range (“Ohms scale”) that may be used to check continuity. Either using a meter or a conductivity/continuity tester, measure between the two screw terminals of this switch: if the resistance is low (good conductivity), then the switch is closed. If the measured resistance is infinite (no conductivity), then the switch is open.
Notes:This is another question which lends itself well to experimentation. A vitally important skill for students to develop is how to use their test equipment to diagnose the states of individual components.
An inexpensive source of simple (SPST) switches is a hardware store: use the same type of switch that is used in household light control. These switches are very inexpensive, rugged, and come with heavy-duty screw terminals for wire attachment. When used in small battery-powered projects, they are nearly indestructible!
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Question 6 of 18
Identify the following types of switches, according to the number of “poles” and “throws” each switch has:
Reveal answer
Notes:Switches come in all types and sizes, and it is important for students to recognize certain common switch types, both by name and by schematic symbol.
Question 3: but there is a difference! Electricity flows in from positive side, the location impacts the light switch