Question

A generator is a device that _____.

uses an electromagnet to turn an axle

has fanlike blades that turn when pushed

increases or decreases the voltage and current of two AC circuits

converts mechanical energy into electrical energy by rotating a coil of wire in a magnetic field

Answer 1

converts mechanical energy into electrical energy by rotating a coil of wire in a magnetic field

Step-by-step explanation:

generator is based on the principle of Electromagnetic Induction given by Faraday's law.

As per above law rate of change in magnetic flux will induce EMF in closed coil.

`EMF = (d\phi)/(dt)`

here we know

`\phi = BAcos\theta`

so we will have

`EMF = (d)/(dt)(BAcos\theta)`

`EMF = BA\omega sin\theta`

so in this way if we rotate a coil between magnetic field of strong magnets by using mechanical energy then it will produce electric energy.

Answer 2

Th correct option is D.
A generator operates by converting mechanical energy into electrical energy by rotating coils of wire around magnetic field. There are two types of generator, a direct current generator and an alternating current generator.