How Do Computers Keep Time When Turned Off? Explained

Discover how computers maintain accurate time even when powered off using a Real-Time Clock (RTC) and a battery.

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Computers keep time when turned off through a small battery-powered device called the Real-Time Clock (RTC). This clock runs independently of the main power supply, ensuring that system time remains accurate even when the computer is off. The RTC battery, often a lithium coin cell, can last several years, providing continuous timekeeping.

FAQs & Answers

  1. What is a Real-Time Clock? A Real-Time Clock (RTC) is a battery-powered device that keeps track of the current time, even when a computer is turned off.
  2. How long does a RTC battery last? The RTC battery, typically a lithium coin cell, can last several years, providing continuous timekeeping for your system.
  3. Can computers keep time without power? Yes, computers can keep time without power thanks to the Real-Time Clock, which operates independently on battery power.
  4. Why do computers need to keep time? Keeping accurate time is crucial for scheduling tasks, timestamping files, and ensuring proper function in network communications.

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