Photocells are renewable energy source
A photocell contains two pieces of silicon joined together to make a P-Q Junction
One piece of the silicon has an impurity added to produce an excess of free electrons - P Junction
Sunlight contains energy packets called:
Electrons
Photons
The output from a photocell depends on:
The Light Intensity
The type of light used
The sun is very hot and produces...
Gamma Rays
Microwaves
Infrared
The problem with Wind Turbines is...
They are expensive
The amount of electricity generated depends on the strength of the wind
They are dangerous
Infrared Radiations pass through windows as short wavelengths
Glass _________ this longer wavelength radiation back inside the building.
Refracts
Reflects
