The correct answer is B. Rectifier.
A rectifier is an electrical device that converts alternating current (AC) to direct current (DC). This is done by using a semiconductor device, such as a diode, to allow current to flow in only one direction.
A transformer is a device that transfers electrical energy from one circuit to another without changing the frequency of the power. This is done by using two coils of wire that are wrapped around a common core. The current in one coil creates a magnetic field, which induces a
current in the other coil.An induction coil is a type of transformer that is used to create a high voltage from a low voltage. This is done by using a coil of wire that is wrapped around a core of iron. When current flows through the coil, it creates a magnetic field that induces a current in the core. This current then flows through the secondary coil, which is connected to the load.
A dynamo is a device that converts mechanical energy into electrical energy. This is done by using a rotating coil of wire that is placed in a magnetic field. The rotation of the coil creates a current in the wire, which is then used to power a load.
In conclusion, the correct answer to the question “A device used for converting a.c. into d.c. is called” is B. Rectifier.