What is the circuit that converts an alternating (ac) voltage into a unidirectional (dc) voltage called?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → A rectifier
NCERT (2026-27):
Application of Junction Diode as a Rectifier – “From the V-I characteristic of a junction diode we see that it allows current to pass only when it is forward biased. So if an alternating voltage is applied across a diode the current flows only in that part of the cycle when the diode is forward biased. This property is used to rectify alternating voltages and the circuit used for this purpose is called a rectifier.”