Telephone, Radio, and Television Flashcards

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1
Q

What is an Electret?

A

A material with a constant electric charge.

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2
Q

What is an Electret microphone?

A

A type of microphone that uses an electrically charged membrane mounted on an electret.

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3
Q

What is a Speaker Cone?

A

A thin membrane in the speakers of a telephone.

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4
Q

What is Atmospheric Transmission?

A

The passage of an electromagnetic wave through the atmosphere between a transmitter and a receiver.

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5
Q

What is Physical Transmission?

A

Transmission of signals by wires.

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6
Q

What is a Diode?

A

A device used to convert alternating current.

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7
Q

What is a Transceiver?

A

A transmitter or receiver.

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8
Q

What is a Cell?

A

The area covered by each antenna.

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9
Q

What is a Carrier?

A

A wave that can be modulated to send a signal.

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10
Q

What is a Modulate?

A

The changing of a wave’s amplitude or frequency to send a signal.

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11
Q

What are the two types of Modulation?

A

AM and FM.

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12
Q

What is Line-Of-Sight Transmission?

A

The ability of high frequency transmissions to only be carried by simple straight lines.

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13
Q

What does AM stand for?

A

Amplitude modulation.

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14
Q

What does FM stand for?

A

Frequency modulation.

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15
Q

What are Ground Waves?

A

Waves that follow the curvature of the Earth for some distance.

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16
Q

What are Sky Waves?

A

Sky Waves are waves that spread out from antennas into the sky and are reflected in the upper atmosphere, which contains charged particles.

17
Q

What is a Tuner?

A

A device that adjusts antennas.

18
Q

What is a Cathode-Ray Tube?

A

A tube that uses an electron beam to create a display on a phosphorescent screen.

19
Q

What is a Pixel?

A

The smallest element of a display image.