Presentation about system unit

1. System unit
Hassan Iqbal

2. System Unit
 The system unit is the box-like case that
contains the electronic components of a
computer.
 Devices like the power supply, different drives,
the fan, the connectors, and the motherboard.
 Other names for the system unit include the
computer chassis, cabinet, box, tower,
enclosure, housing, or simply case.
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3. Parts of it
 These are some of the major components
found inside system unit
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4. Mother Board
 The motherboard is sometimes called the
system board or main board
 It is the main circuit board of a microcomputer
 This component contains the connectors for
attaching additional boards
 All other parts connect in one way or another
to the motherboard.
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5. Diagrammatical Representation
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6. Diagrammatical Representation
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7. Mother board
 The motherboard makes sure all those
components of the system all runs together
properly, without any sparks or grating noises
 Think of it like the nervous system or
circulatory system of the computer
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8. Ports in mother board
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9. Hard disk Drive
 A hard disk drive is a high capacity, non-
volatile, magnetic data storage device with a
volume (disk) that is usually non-removable.
 Data is magnetically read and written on the
platter by read/write heads that float on a
cushion of air above the platters.
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10. Diagrammatical Representation
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11. Energy in controller
 The controller doesn’t drive enough current to
turn on or move the hard drive motors.
 So all hard drives use a motor driver chip.
 It takes the commands sent from the
controller to the motors and passes them to
the motors, but with a higher current
 So, this chip is located between the controller
and the motors.
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12. RAM
 Forth main chip you can find on a logic board
is the RAM (Random Access Memory) chip,
also known as buffer
 This chips has an ultimate role in the hard
drive performance
 The higher its capacity, the fastest the data
transfer between the drive and the computer
will be.
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13. Power Supply Unit
 The power supply unit (PSU) is used to convert
AC currents from the main supply to the different
DC voltages required by various computer
components.
 Power supplies are quoted as having a certain
power output specified in watts, A standard power
supply would typically be able to deliver around
350 watts.
 You will need more power from the power supply if
your PC has more operating components
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14. Representation
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15. CD-ROM drive
 This is a high capacity optical data storage
device with a removable disk. It writes data
onto or reads data from a storage medium.
 A CD-ROM drive connected to the computer.
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