Question

To convert mechanical energy into electrical energy, one can use
This question has multiple correct options
A.DC dynamo
B.AC dynamo
C.Motor
D.transformer

Answer 1

Hint: When a current carrying coil is placed in an external magnetic field, it experiences a force. In order to convert mechanical energy to electrical energy, we need a type of circuit in which we have a current carrying coil and an external magnetic field.

Complete step-by-step answer:
According to the law of conservation of energy, energy can neither be created out of nothing nor destroyed into nothing. It can only be converted from one of its forms to another form.
There are devices that can convert one form of energy into another. Such devices are generally called transducers.
Dynamo is a device that converts mechanical energy into electrical energy. The structure of dynamo is such that when a coil is moved in the presence of an external magnetic field, then a current is produced in the circuit. In this way, the mechanical energy of a rotating coil can be converted into electrical current flowing through the circuit.
There are two types of dynamo based on the type of current they produce: AC dynamo and DC dynamo. AC dynamo produces alternating current while a DC dynamo produces direct current.

Hence, the correct answers are options A and B.

Note: 1. An electric motor is a device that converts electrical energy into mechanical energy. We can have a DC motor or an AC motor. Its working is based on the fact that current flowing in a wire produces a magnetic field around it and when placed in a magnetic field, the current-carrying coil experiences a torque.
2. A transformer does not perform the conversion of energy from one form to another. It is used for magnetically coupling two different electronic circuits with each other.