Elenco Snap Circuits® Home Learning - Manual (Page 28)

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Materials List
2 2-Snap Wires
2 3-Snap Wire
1 Battery Holder (B1)
1 LED (D1)
1 100 Ohm Resistor (R1)
1 Slide Switch (S1)
1 Press Switch (S2)
Use the table on the right to determine what happens for each combination.
Enter under the heading "D1" the words "ON" or "OFF" for each switch
Position shown on the left. This table is called a "Truth Table".
What do you think the name of a circuit with the same truth table would be called?
______ AND Gate ______ OR Gate ______ NOT Circuit _______ IF Gate
This logic is no good for a two way light switch because once one switch is closed the other has no affect on the light. Where
would this type of logic be useful in the home? Think about home protection from people that might want to break into your
house.
______________________________________________________________________________________________________
Optional activities related to computers and electronic logic.
Build the circuit shown on the left.
What are the three positions of the
switches that make the LED light up?
Think of all the possible switch
positions.
TRUTH TABLE
S1 S2 D1
OFF OFF
ON OFF
OFF ON
ON ON
Activity 19
This OR That OR Both