eli5 how does elecronics know the time

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How does my ofen know how long a second is if its not connected to the internet?
I set the time once and it just knows the time but how?

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Anonymous 0 Comments

Your oven has a computer chip in it. That chip can keep track of time once you tell it what time it is as long as it has power because it’s programmed to do so. If it loses power it “forgets” and needs to be reset.

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