Computers introduction for class 5 students is given in my ppt

4. Abacus
• Its the first known device used for calculation
• It was invented more than 5000 years ago
• It was used in china for counting

6. Difference Engine
• Charles Babbage designed the Difference
Engine in 1822 to prepare mathematical
tables
• It had many similarities with modern
computer

8. MARK-1
• It was first automatic digital computer
• It was made in 1944

11. ENIAC

12. • It was the first general purpose computer
• It used vaccum tubes
• It was very large in size.

13. Generation 1 : ENIAC
The ENIAC (Electronic Numerical Integrator and Computer) was unveiled in 1946: the
first all-electronic, general-purpose digital computer

14. UNIVAC-1

15. UNIVAC-1
• It was made in 1951
• It was faster than previous computers.