为何电动发电机无法用作永动机？技术矛盾点问询

Hey there, let's break down why this perpetual motion machine idea using electric generators won't work—thermodynamics and electromagnetics don't cut any slack here:

Let's start with the core of your plan: electromagnetic induction-based generators. Here's why they can't power a perpetual system:

• Conductor heating equals unavoidable energy loss
  When electricity is generated via electromagnetic induction, the conductors carrying the current have inherent electrical resistance. By Joule's Law (P = I²R), current flowing through a resistive material converts electrical energy directly into heat. This heat dissipates into the environment, and there's no way to recapture 100% of it—so you're losing energy from the moment you start generating.

• Generated current creates counteractive forces
  The current your generator produces creates its own magnetic field (Ampère's Law). This field directly opposes the original magnetic field driving the generator's rotation (Lenz's Law). To keep the generator spinning, you have to input extra energy to overcome this opposing force—energy you can't recover from the generated electricity.

• Mechanical losses add to the drain
  Even if you ignored electrical losses, there's no such thing as friction-free movement. Bearings, belts, or any moving parts will generate friction that turns mechanical energy into heat. Air resistance for exposed components adds another steady energy drain that you can't eliminate.

At the end of the day, perpetual motion machines violate the first and second laws of thermodynamics: you can't create or destroy energy, and you can't convert energy between forms with 100% efficiency. No combination of generators or motors can get around these fundamental, unbreakable rules.

内容的提问来源于stack exchange，提问作者Christian Ivicevic