Answer: Logic Lights #109

The lamp is ON. It lights up!

Yellow wires carry power. Grey wires don’t.

Gate by gate

A AND B → OFF AND OFF = OFF
(A AND B) AND C → OFF AND ON = OFF
NOT ((A AND B) AND C) → NOT OFF = ON

The same circuit in Python

Python has the same three gates built in: and, or and not. ON is True and OFF is False.

A = False
B = False
C = True

lamp = not ((A and B) and C)
print("Is the lamp on?", lamp)

When you run it, it prints:

Is the lamp on? True

Try it: change one of the switches from True to False (or the other way round) and run the code again. Can you find a switch that changes the lamp?

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