Question

The process of converting alternating current into the direct current is known as
(A) Modulation
(B) Amplification
(C) Detection
(D) Rectification

Answer 1

Hint:The alternating current needs to be converted to the direct current because the alternating current cannot be stored while the direct current can be easily stored. Also, many devices require constant voltages but our home supplies receive alternating current, so it needs to be converted. The process of converting a.c. to d.c. is called rectification.

Complete step by step solution:
Rectification: The process of converting AC to DC is called rectification. The device used for rectification is called the rectifier.

The figure shows the basic diagram of a full-wave rectifier. For the first half period signal is positive, Diode 1 is forward biased and starts conducting and Diode 3 is reverse biased and acts as an open circuit. For the second half period, the lower end is positive and D4 starts conducting and D2is reverse biased and acts as an open circuit. Hence voltage across load resistance is always positive. In this way, the rectifier converts AC to DC.
Input AC signal

Output waveform

The correct option is (D) Rectification

Additional information:Other than Full-wave rectifiers, halfwave rectifiers are also used which convert only the first half or second half of the signal clip to the other part. Signal by Rectified is not constant but always changing with input, hence it is called pulsating DC.

Note:Let us understand the other options too. Modulation is the process of converting digital data into radio waves. A carrier signal having constant amplitude and frequency is the modulation process. Information is added by changing amplitude, frequency, or phase. Amplification is the process of making a signal strong by increasing its amplitude.