Name ____________________________
Period __________
Quiz 2 – Term 2
1) Identify whether the following materials are electrical insulators or conductors:
a. Plastic straw
______________________________
b. A nickel
______________________________
c. Iron
______________________________
d. Styrofoam
______________________________
e. Newspaper ______________________________
f. Cooking pan
______________________________
g. Sweater
______________________________
h. Air
______________________________
2) Match the following words with their definitions:
Current
______
a. Wave cycles per second, measured in Hertz (Hz)
Frequency
______
b. Material that does not allow electricity to flow
Analog
______
c. Anything that opposes (slows) electricity flow.
Load
______
d. Height of a wave
Resistance
______
e. Rate of charge flow per second (I)
Wavelength
______
f. Continuous signal, has a range of values
Electrical insulator
______
g. Signal of discrete values, 0s and 1s
Electrical circuit
______
h. Anything that uses electricity from a circuit
Name ____________________________
Period __________
Digital
______
i. The length between wave crests.
Amplitude
______
j. A closed loop that conducts electricity.
3) Show which parts of the light bulb need to be connected to wires in a circuit so that
the light bulb will light up.
4) For the schematic diagram below, label the batteries, light bulbs, and switches.
Also, label the positive side of the battery.
Of the parts of the circuit above, which part is the…
Energy source?
___________________________
Connector?
___________________________
Name ____________________________
Period __________
Controller?
___________________________
Output device?
___________________________
5) Identify which part of the signal communication path the following are describing
(encoding, transmitting, receiving, or decoding).
a) A person’s eardrum vibrates when sound waves from someone speaking hit their ear.
_________________________________
b) A telephone changes an electrical signal into a voice that the listener can understand.
_________________________________
c) A radio tower broadcasts radio waves to a satellite above the Earth.
_________________________________
d) A computer changes a typed message into binary code so that it can be sent online.
_________________________________
e) A satellite sends a signal to Earth.
_________________________________
f) A person thinks about saying something, then speaks.
_________________________________
6) Which part of the Electromagnetic Spectrum are the following examples of?
Choices: Radio, Microwaves, Infrared, Visible Light, Ultraviolet, X-ray, Gamma
Name ____________________________
Period __________
a) the doctor or dentist might use these ______________________________
b) emitted by cell phones
______________________________
c) ROYGBIV, the only light we can see
______________________________
d) night vision & thermal imaging
______________________________
e) AM & FM signals
______________________________
f) causes sunburn
______________________________
g) the highest energy waves
______________________________
7) Show the path that light will travel through the optical fiber.
Light source
8) Determine if the description is (D) digital, (A) analog, or (B) both.
A) a continuous wave
________
B) the key board on a computer
________
C) TV signals as of 2009
________
D) the sound you hear from me talking
________
E) the signal from your cell phone to the tower
________
Name ____________________________
Period __________
F) 011000101
________
G) a camera
________
H) the signal from one computer to another computer
________
Short answer:
1.
Give three reasons why fiber optics cable is better than cable.
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
________________________________________________________
Name ____________________________
Period __________
2.
What is total internal reflection and why is it important to fiber optics?
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_________________________________________________________