World Timer Alarm
World Timer Alarm
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How can digital clocks count seconds?
Is there some kind of mechanism in digital alarm clocks, microwaves, digital timers, etc. that tells the device when a second/minute/etc. has passed? How in the world does this work?
I can't say directly what happens in alarm clocks, but with computers they have clock chips which "click" thousands, millions and even billions of times per second. They include circuits which can count to some number of clicks (let's say 1000) then they themselves "click", these are called frequency dividers. The original IBM PC's time clock ticked like 18000 times per second (If my memory is right), so the clock circuit would keep track and every 18000 clicks, it would increment the clock by one second. It's actually more complex than that, but that's basically how it worked/works. With more basic devices like microwaves, watches etc. They still use a clock chip (often a quartz crystal) which oscillates (generates a wave type signal, (up and down)) at a certain frequency. So if the clock chip runs a 1.2 KiloHertz (Hertz is a measurement of frequency, 1 Hz=1 cycle per second, 1.2 Kilo(thousand)Hertz = 1,200 ticks per second), the circuitry will count to 1200 and increment the seconds on the clock. When the seconds get to 60, it increments the minutes by one and resets the seconds to 0, of course it won't display 60 in the seconds, it changes it to 0 first, then displays the new time. This is a basic description of timing circuits, I may be a little off on some minor technical details, but in principle, this is how it works.
PS: Seach Wikepedia for "Timers" and "Clocks" (then find digital clocks)