Answer: Logic Lights #45

The lamp is ON. It lights up!

Yellow wires carry power. Grey wires don’t.

Gate by gate

B AND C → OFF AND OFF = OFF
A OR (B AND C) → ON OR 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 = True
B = False
C = False

lamp = A or (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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