Big Idea 5 W2 Digital Clocks

What forms the brightly lit numbers of a digital clock?

• Photons

• Electrons

• Display

• LEDs

Each digit on the display of a digital clock is divided into how many segments?

• Five

• Six

• Seven

• Eight

The segments on a digital clock light up when ____receive electrical energy.

• display

• photons

• electrons

• vibration

What do charged electrons release in the form of light energy?

• Circuits

• Photons

• Heat

• Sound

Tags

NGSS.MS-PS4-1

Which of the following is more efficient than an ordinary light bulb?

• Incandescent bulb

• Fluorescent bulb

• LED

• Halogen bulb

Tags

NGSS.MS-PS3-5

Line A is pointing at the LED or photons of the circuit?

• LED

• photons

Tags

NGSS.MS-PS4-2

Line B is pointing at the LED or photons of the circuit?

• LED

• photons

T/F LED's convert electrical energy into heat energy.

• True

• False LEDs do not have anything to do with electricity.

• False, LED convert to electrical energy to light energy.

T/F Excited electrons release light energy in the form of photons.

• True

• False they release light energy in the form of circuits.

• False, the electrons can not be excited.

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

T/F An LED is less efficient than an ordinary light bulb.

• True

• False they release light energy.

• False, LED are more efficient.