why can't we create energy from magnets?

Answer 1

We can not create energy, not from magnets nor from anything else. However, we can convert energy from one form to another. So magnets are used in hydroelectric plants (electric generators), or in the car (alternators) to convert kinetic energy into electric energy.

In hydroelectric plants, the water running down from the top of the dam to the bottom rotates a wheel that is connected to an electric generator, which contains magnets that will generate an electric current when the magnets are rotated.

Similarly for alternators, when the car is running (on gas), the petrochemical energy is converted into kinetic energy which in turn rotates the magnets inside the alternator, which then can generate electric currents.

Answer 2

We do create energy from magnets! However, there is a catch. Energy is created when a magnetic field changes - in other words, the magnets have to move.

Water flowing through a dam, for example, turns a generator, which is a whole bunch of powerful magnets, surrounded by a whole mess of wires. The magnets create current in the wires, generating electricity.

Anything that can get those magnets moving generates electricity, whether it's steam power, coal, or a nuclear plant.

Answer 3

A better way to phrase this is to say magnets (or magnetic fields) do no work. Remember that the force exerted by a magnetic field is F=qv x B. Because it is a cross product the the force is exerted perpendicular to the magnetic field and the velocity. Now work,which is just the change in energy, is W=F dot delta D. Delta D is in the direction of v which is perpendicular to F and the dot product of two perpendicular vectors is 0. Therefore the magnetic force does no work.

Answer 4

this is a guess, but....

Force is required in order to generate electricity. A coil of wire is rotated around magnets and the alternating current produced is used to power other devices. the problem is that more energy is consumed then produced due to friction. the friction creates heat (another form of energy) and thus there is waste because the heat is disappated to the atmosphere.

Look into generators and coils and fields and it will give you much more info.

Good Luck!!

Answer 5

A magnet gets energy when it is made , and it has potential energy in it as magnetic field .If you demagnetize it it will give off the stored energy .

Answer 6

Hi. And an alternator. Converts rotating energy to electrical. You are only changing energy from one form to another, of course.

Answer 7

We can't create energy but we can harness energy from all the sources listed above.

Answer 8

Just for the hell of it, I'd like to point out that you can't create energy. >.>

For example, powerplants don't create energy. Instead, they use energy to convert energy into something usable.

Answer 9

For the same reason you can't create energy with gravity. It is called perpetual motion and is impossible.

Answer 10

magnets are how they make roller coasters blast off,,,and its how the monorail runs at Disney,,,,,they've been using the power from electro magetic energy for many-many years,,,,Rob N,,,,hydro electric is energy from water,,,not magnets,,,,hello