Question

A rectifier is used to

• A. convert a.c. to d.c.
• B. amplify a weak signal
• C. generate intermittent voltage
• D. convert d.c. to a.c.

Hint:

Think of a rectifier as a "one-way street" sign for electricity. Because diodes only let current flow one way, they chop off or flip the reverse part of an AC wave, leaving you with DC.

Answer 1

The Correct Option is A

Step 1: Understand the question.
We must say what a rectifier is used for, choosing from the given options.

Step 2: Recall what a rectifier is.
A rectifier is a circuit made of diodes. A diode lets current pass in only one direction. So a rectifier turns two way alternating current into one way direct current.

Step 3: Check option about amplifying.
Making a weak signal stronger is the job of an amplifier, not a rectifier. So this is wrong.

Step 4: Check option about intermittent voltage.
Making a repeating on and off or wave shaped voltage is the job of an oscillator. So this is wrong.

Step 5: Check option about d.c. to a.c.
Changing direct current into alternating current is the job of an inverter, which is the opposite of a rectifier. So this is wrong.

Step 6: Pick the right one.
A rectifier converts a.c. to d.c. This matches option (1).
\[ \boxed{\text{A rectifier converts a.c. to d.c.}} \]