These batteries are listed at 1 Ah when drawing 1 A. Another approach is to consider rated capacity of an AA battery from a data sheet. Four batteries therefore provide 40 kJ and the battery pack would last for 40,000J/(60J/s) =667 s or 11 min. How long would the batteries last? Answer: One approach is to assume each battery contains 10kJ when new. With a 10 A current draw, such a battery pack could provide the 60 W draw of a laptop. Question: 4 AA batteries wired in series would provide 6 V. Laptops are powered by internal rechargeable batteries with typical capacity of 2800 mAh at 14 V, and these batteries are charged using AC adapters that consume ~ 80 W (80 J/s). Current laptops typically weigh 1-2 kg and occupy volumes of, perhaps, 30 cm x 30 cm x 2 cm ~ 2000 cm 3. The other devices are either integrated within the housing, as in a laptop, or are arranged as desk-top peripherals.
The I/O block contains familiar devices that allow the user to interact with the computer.Ĭonsider the physical space, weight, and power requirements for any computer: the CPU is a single IC chip, which, along with ROM, RAM, and other devices, is installed on a mother-board (circuit board). The RAM is volatile, meaning that its contents are emptied when the computer is shut off, whereas the ROM is non-volatile: memory contents are permanently placed into ROM so that they are available to provide boot-up instructions on power-up.
Major components of a general purpose computerĪ computer is comprised of a central processing unit (CPU) as well as storage: mass storage for programs and other content, volatile RAM for storing information needed by the CPU during program operation, and ROM for booting the computer. Everyone is familiar with the use of a general purpose computer (eg, a laptop), a simplified block diagram of which is shown below.
0 kommentar(er)
