The document summarizes different components of a computer system unit. It discusses the processor, memory, adapter cards, and power supply as the main components inside the system unit case. It also describes the two main types of memory as RAM and ROM. RAM is volatile memory that loses its contents when power is turned off, while ROM is non-volatile and retains data without power. Examples of RAM include SRAM and DRAM, while examples of ROM include PROM and EPROM.

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Submitted to :
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Submitted by:
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Assignment :
Roll no :
Class :

2. SYSTEM UNIT
 Casethatcontainelectroniccomponentofthecomputerusedtoprocess
data.
 Sometimescalledchassis.
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3. COMPONENTS OF SYSTEM UNIT
 Processor.
 Memory.
 Adapter cards.
 Power supply.
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4. MEMORY TYPES
1. RAM
 random access
memory.
 it volatile memory.
 they lose their
contents when the
power is turned off.
2. ROM
 read only memory.
 it is non volatile.
 They cannot lose their
data when power is
turned off.
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5. FURTHER TYPES OF RAM AND ROM
I. SRAM.
 STATIC RANDOM
ACCESS MEMORY.
II. DRAM.
 DYNAMIC RANDOM
ACCESS MEMORY.
I. PROM.
 PROGRAMABLE
READ ONLY
MEMORY.
II. EPROM.
 ERASABLE
PRORAMABLE READ
ONLY MEMORY.
 RAM  ROM
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6. 0
10
20
30
40
50
60
70
0
20
40
60
80
100
120
140
160
CHART USE
Volume
Open
High
Low
Close
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7. SR NO NAME SUBJECT OBTAINED
MARKS
TOTAL
MARKS
1 ALI ENG 95 100
2 AHMAD MATH 55 75
3 TANIA BIO 66 75
4 EMAN CHEM 45 75
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table

8. ALI
AHMAD
AADIL
LOVES
MY GIRL
FRIEND
8
smartart

9. MR BLACK
MR
BLU
E
MR
RED
9
shapes

10. 10
picture