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Solar energy can be converted into some other useful form of energy sources using different conversion technologies as in Table 1.4. The methods are photoelectric, photoelectric-photothermal, photothermal, photochemical, photocatalytic, and photo-electrochemical conversion.

Table 1.4 Energy conversion [11].

Energy	From light	From chemical	From electrical	From mechanical	From heat
To Chemical	photo-synthesis	foods	electro-plating	Digestion of food	Gasifier
To Electrical	Solar cells	Powered torch light-battery Fuel cell	Transformer	Wave power Electric generator Windmill	Thermo-electric Geothermal Ocean-thermal power Thermo-couple
To Mechanical	photoelectric	Adenosine triphosphate hydrolysis Chemical Nutrients	Power drill	flywheel	Heat engines
To Light	laser	Most flame-characterized combustions Radium used to be painted	Electric lamp	spark	Match box
To Heat	Solar cells	Burning of wood Firing	Electric heater	Rubbing of hands together	Heat exchanger