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[[Image:Introduction-Part3_html_m21bc9239.png|left]]<br>

[[Image:Introduction-Part3_html_m21bc9239.png|thumb|left]]<br>

Did you know, the first computer was as big as your classroom! 60 years ago,

Did you know, the first computer was as big as your classroom! 60 years ago,

computers were very big, costly and used lot of electricity. The

computers were very big, costly and used lot of electricity. The

circuit 'on' or 'off'. This turning 'on' and 'off' could be used to

circuit 'on' or 'off'. This turning 'on' and 'off' could be used to

instruct computers to do calculations.

instruct computers to do calculations.

[[Image:Introduction-Part3_html_797aeff2.png|thumb|left]]<br>

[[Image:Introduction-Part3_html_797aeff2.png|thumb|right]]<br>

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