AT THE VERY BEGINNING AT THE VERY BEGINNING OF THE HUMAN ENERGY OF THE HUMAN ENERGY WORLD WORLD PEOPLE RELIED ON THEIR PEOPLE RELIED ON THEIR MUSCLES . MUSCLES . .THE MUSCLES OF ANIMALS . .THE MUSCLES OF ANIMALS . . . .FIRE . .FIRE . .OR WIND POWER .OR WIND POWER FROM THE 18 FROM THE 18 TH TH CENTURY, A NEW SOURCE CENTURY, A NEW SOURCE OF ENERGY APPEARED AND DEVELOPED OF ENERGY APPEARED AND DEVELOPED RAPIDLY : RAPIDLY : THE WATER THE WATER THE WATER WHEELS, INVENTED TWO CENTURIES BEFORE CHRIST . THE WATER WHEELS, INVENTED TWO CENTURIES BEFORE CHRIST . . SPREAD ACROSS EUROPE WITHIN A FEW HUNDRED YEARS . SPREAD ACROSS EUROPE WITHIN A FEW HUNDRED YEARS THEY HELPED CRUSH GRAIN THEY HELPED CRUSH GRAIN grain water THEY HELPED SAW WOOD WATER- POWERED COTTON MILL OPERATED DURING 1770S BY WILLIAM STRUTT & RICHARD ARKWRIGHT ENGLAND . . AS THE STEAM ENGINES PROVED MORE FLEXIBLE AND ECONOMICALLY AS THE STEAM ENGINES PROVED MORE FLEXIBLE AND ECONOMICALLY EFFICIENT . EFFICIENT . . THEY GRADUALLY ENDED THE ERA OF . THEY GRADUALLY ENDED THE ERA OF WATER POWER WATER POWER . artificial energy • Steam Engine was developed and Coal became an important fuel Uses of Coals Solar energy A huge breakthrough in the energy s history. THE 18 TH TH CENTURY, A NEW SOURCE CENTURY, A NEW SOURCE OF ENERGY APPEARED AND DEVELOPED OF ENERGY APPEARED AND DEVELOPED RAPIDLY : RAPIDLY : THE WATER