List four conditions that may result in the emission of electrons from a conductor. Compare and contrast characteristics and uses of diodes and triodes.
Identify the functions below as belonging to one of these radio transmission devices: oscillator, transmitting antenna, microphone, or modulator.
Sends out radio waves having the same frequency as the current supplied by the oscillator.
Enables the waves produced by the antenna to “carry” the pattern of the sound waves picked up by the microphone.
Converts a direct current into a high-frequency alternating current.
Picks up sound waves and converts them into suitable electric current with the same pattern as the sound waves.
Identify the functions below as belonging to one of these radio reception devices: receiving antenna, tuner, RF amplifier, demodulator, or loudspeaker.
Strengthens the weak currents set up in the conductor of the antenna.
Intercepts radio signals that have frequencies between widely separated limits.
Receives the audio signals from the F currents and converts them into sound waves.
Separates the audio signals from the carrier waves.
Selects only the desired signals and rejects all other signals.
Color can be described by which three characteristics?
What are the three primary colors used for reproducing all natural colors on a television screen?
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