By: J.C., Spencer, Nick, and Brittney

1
Radiant Energy Transformations

• By J.C., Spencer, Nick, and Brittney

2
What is Radiant Energy?

• Energy transmitted in wave motion, especially
  electromagnetic wave motion through space

3

• Comes from ?

4
What is it used for?

• Electricity
• Transportation
• Space satilites
• Cooking
• Pumping water
• Purifying water
• Heating water (pools)
• Heat air

5
How do we collect Radiant Energy?

• Through
• Solar panels
• Basically, when light strikes the cell, a certain
  portion of it is absorbed within the
  semiconductor material Silicon. This means that
  the energy of the absorbed light is transferred
  to the semiconductor.
• This flow of electrons is a current, and by
  placing metal contacts on the top and bottom of
  the PV cell, we can draw that current off for
  external use.

6
Sunlight and Shade Experiment
START TEMP 5 MIN 10 MIN 15 MIN 20 MIN
IN SUN 68F 78F 81F 82F 84F
IN SHADE 70F 74F 76F 76F 77F
Temp in Fahrenheit
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Radiometer
It is a bulb with black and white colored vanes
inside that spins in the light. The little air
molecules bounce around inside the bulb and hit
the colored panels of the vanes. They bounce off
the black harder than the white panels, making
the vanes spin in the direction of the black
vanes.
8
Glow toys

• A chemical called Phosphor is added to the
  plastic of glow toys.
• Phosphor absorbs radiant energy and stores the
  energy. The stored energy causes the electrons to
  become energized and jump at a higher level.
• When the radiant energy goes away and can no
  longer be stored the electrons slow down and
  release the stored energy, giving off a glow.

9
Real world connections

• Solar panels
• Solar panels are a way of getting energy from a
  renewable resource. Unfortunately the energy
  absorbed from the light is small. Multiple panels
  must be used to get a desired voltage (and solar
  panels are expensive), but when enough panels are
  used it gives a good amount of electricity to
  resident or community using them.

10
conclusion

• Radiant energy is an excellent source of energy
  and in constant supply.
• It works for little things well but is harder to
  get a big amount of energy from it because it
  doesnt convert very well (its not very
  efficient).