Question

which best contrasts an electric generator and an electric motor?
in a generator, slip rings function as a solenoid, and in a motor, an armature functions as a solenoid.
in a motor, slip rings function as a solenoid, and in a generator, an armature functions as a solenoid.
a generator converts electrical energy to kinetic energy, and a motor converts kinetic energy to electrical energy.
a generator converts kinetic energy to electrical energy, and a motor converts electrical energy to kinetic energy.

Explanation:

To solve this, we analyze the function of electric generators and motors:

• A generator works on the principle of electromagnetic induction. It takes kinetic energy (e.g., from a turbine, hand - cranking) and converts it into electrical energy.
• An electric motor works on the principle of the magnetic effect of current. It takes electrical energy and converts it into kinetic energy (to rotate a shaft, for example).

Now let's analyze each option:

• Option 1: Slip rings in a generator do not function as a solenoid, and the description of the motor's armature is also incorrect. So this option is wrong.
• Option 2: Slip rings in a motor do not function as a solenoid, and the description of the generator's armature is incorrect. So this option is wrong.
• Option 3: A generator converts kinetic energy to electrical energy (not electrical to kinetic), and a motor converts electrical energy to kinetic energy (not kinetic to electrical). So this option is wrong.
• Option 4: This option correctly states that a generator converts kinetic energy to electrical energy and a motor converts electrical energy to kinetic energy.

Answer:

A generator converts kinetic energy to electrical energy, and a motor converts electrical energy to kinetic energy.