Correct Answer: mechanical energy into electrical energy

Solution : The correct answer is converts mechanical energy into electrical energy.

Dynamo is an electrical generator which converts mechanical energy of rotation into electric energy in the form of current. It is formed by placing a conducting wire between the north and south poles of a permanent magnet. So according to principles of electromagnetism when this wire is moved it generates a current which starts flowing through the wire. This is how a Dynamo works. It is the working principle behind most of the electric motors.