Question

A rectifier converts which type of current into which other type?

Hint:

Think of what happens inside a mobile phone charger to the wall supply.

Answer 1

Step 1. Recall what a rectifier is. A rectifier is a circuit, usually built from one or more diodes, that is used to change one form of electrical current into another.
Step 2. A diode allows current to pass easily in only one direction, called the forward direction, and blocks current in the reverse direction.
Step 3. Alternating current, or A.C., keeps changing its direction many times every second. When A.C. is passed through a diode based rectifier circuit, only the part of the current flowing in the allowed direction gets through, so the output flows in one direction only. This one direction current is called direct current, or D.C.
Step 4. Half wave rectifiers use one diode and pass only one half of each cycle, while full wave rectifiers use two or four diodes to use both halves of the cycle, giving a smoother D.C. output.
Answer. A rectifier converts alternating current (A.C.) into direct current (D.C.).