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  2. Adder (electronics) - Wikipedia

    en.wikipedia.org/wiki/Adder_(electronics)

    The layout of a ripple-carry adder is simple, which allows fast design time; however, the ripple-carry adder is relatively slow, since each full adder must wait for the carry bit to be calculated from the previous full adder. The gate delay can easily be calculated by inspection of the full adder circuit. Each full adder requires three levels ...

  3. Time clock - Wikipedia

    en.wikipedia.org/wiki/Time_clock

    Electronic time clock. A time clock, sometimes known as a clock card machine, punch clock, or time recorder, is a device that records start and end times for hourly employees (or those on flexi-time) at a place of business. In mechanical time clocks, this was accomplished by inserting a heavy paper card, called a time card

  4. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The equation of time was engraved on sundials so that clocks could be set using the Sun. In 1720, Joseph Williamson claimed to have invented a clock that showed solar time, fitted with a cam and differential gearing, so that the clock indicated true solar time. [137] [138] [139]

  5. Clock - Wikipedia

    en.wikipedia.org/wiki/Clock

    An analog pendulum clock made around 18th century. A clock or chronometer is a device that measures and displays time.The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, and the year.

  6. Carry-select adder - Wikipedia

    en.wikipedia.org/wiki/Carry-select_adder

    The carry-select adder generally consists of ripple-carry adders and a multiplexer.Adding two n-bit numbers with a carry-select adder is done with two adders (therefore two ripple-carry adders), in order to perform the calculation twice, one time with the assumption of the carry-in being zero and the other assuming it will be one.

  7. Four-phase logic - Wikipedia

    en.wikipedia.org/wiki/Four-phase_logic

    The ϕ1 and ϕ3 clocks need to be non-overlapping, as do the ϕ2 and ϕ4 clocks. Considering the 1 gate, during the ϕ1 clock high time (also known as the precharge time), the output C precharges up to V(ϕ1)−V th, where V th represents the threshold of the precharge transistor.

  8. CPU time - Wikipedia

    en.wikipedia.org/wiki/CPU_time

    CPU time (or process time) is the amount of time that a central processing unit (CPU) was used for processing instructions of a computer program or operating system. CPU time is measured in clock ticks or seconds. Sometimes it is useful to convert CPU time into a percentage of the CPU capacity, giving the CPU usage.

  9. Striking clock - Wikipedia

    en.wikipedia.org/wiki/Striking_clock

    Home striking clocks, such as mantel clocks, cuckoo clocks, grandfather clocks and bracket clocks are also very common. A typical striking clock will have two gear trains , because a striking clock must add a striking train that operates the mechanism that rings the bell in addition to the timekeeping train that measures the passage of time .

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