The process of combining low-frequency signal with high-frequency carrier waves is called
Correct answer: C. Modulation
- A. Rectification
- B. Amplification
- C. Modulation
- D. Magnification
Explanation
Modulation is the process of varying the characteristics of a carrier wave (high-frequency signal) in proportion to the information signal (low-frequency signal) being transmitted. Common types of modulation include amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM).
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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