In the 7th Century B.C.

In 1883

In 1954

In 1905

Isaac Newton

Charles Fritts

Scientists at Bell Labs

Albert Einstein

It is composed of photons

It can behave as a particle or 'photon'

It can only behave as a wave

It cannot be converted into electricity

The first solar-powered calculator

The modern solar-electric cell

The theory of relativity

The first solar-powered satellite

The discovery of new planets

The invention of the internet

Engineering improvements making solar cells cheaper and easier to make

Decrease in the use of silicon

Solar panels convert the sun's energy into electricity through photovoltaic cells that generate delectricity when sunlight excites the electrons

the flow of electrical power/moving electron

Geothermal energy

Wind turbines

Hydroelectric power

Solar photovoltaics (PV)

A single layer of semiconductor material

A magnetic field

A combination of gases

A positive and a negative layer

Atoms

Molecules

Photons

Electrons

Its weight

Its efficiency and electrical output

Its color and design

Its cost only

Has many moving parts and makes noise

Produces clean energy, no emissions, and doesn't need water

Can only be located far from where the power is needed

Requires fossil fuels to produce power