1.Thereareseveralpossibilities:increasetheefficiencyofpresenttechniquesinordertoreduceenergyconsumption,andinvestintonewtechnologiessuchassolarpower,windpowerandfuelcells,forexample.
2.Acomputerisaprogrammablemachinethatreceivesinput,storesandmanipulatesdata,andprovidesoutputinausefulformat.
Computersareavailableindifferentshapes,sizesandweights,duetothesedifferentshapesandsizestheyperformdifferentsortsofjobsfromoneanotherandthereforecanbeclassifiedindifferentways.
Theworkingprocessofacomputerisbasedonabinarysystem.Eachproblemisdescribedinasequenceof1and0,viasoftwareprogrammesasolutioncanbecalculated.
Ageneralpurposecomputerhasfourmaincomponents:thearithmeticlogicunit(ALU),thecontrolunit,thememory,andtheinputandoutputdevices(collectivelytermedI/O).Thesepartsareinterconnectedbybusses,oftenmadeofgroupsofwires.