What does a light switch do when you flip it on?
AnswerCloses the circuit so current flows
Closing the circuit lets current reach the light.
Tech · Facts & stats
On facts & stats
7 fact-checked facts about on and off switches, power and binary logic, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What does 'LED' stand for?
AnswerLight-emitting diode
An LED is a light-emitting diode.
Going deeper
Which tiny component acts as an on/off switch billions of times inside a computer chip?
AnswerTransistor
Transistors switch on and off to represent bits.
A switch that stays on until you press it again, like a clicky pen, is called what?
AnswerLatching switch
A latching switch holds its state until pressed again.
A doorbell button that only works while held down is which type of switch?
AnswerMomentary switch
A momentary switch is on only while pressed.
Expert level
In U.S. home wiring, what are the switches called that control one light from two locations?
AnswerThree-way switches
A pair of three-way switches controls one light from two places.
Who showed in a 1937 master's thesis that switching circuits can carry out Boolean logic?
AnswerClaude Shannon
Claude Shannon's thesis linked relay circuits to Boolean algebra.
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