How do two series switches and a lamp model an AND gate?

Solution & explanation

With a small cell-and-lamp circuit, put switches A and B in series. Define closed = 1 and lit = 1. Test all four states: 00,01,10 leave the path open and output 0; only 11 completes it and lights the lamp. This is a switch model of Boolean AND, not the internal transistor circuit of a gate chip.