Inverter

And this is actually called a commutator, where this part that's connected to our rotating piece, that's the commutator.

You didn't have to use the commutator.

A parabolic (or paraboloid or paraboloidal) reflector (or dish or mirror) is a reflective surface used to collect or project energy such as light, sound, or radio waves.

So now using the commutator, we have essentially created an electric motor.

Or another option, you don't have to use a commutator.

Now we assume that the commutator has gotten back in touch.

Remember, before we had this commutator and everything, if we just flipped it over, the current, because before when we didn't have the commutator, the current here was flowing down here, up here.

And before the commutator, we had the current flowing down here and up here.

Before the light bulb was invented, people had figured out how to put a reflector behind it, focus it a little bit put lenses in front of it, focus it a little bit better.

And I said ideally maybe your commutator loses touch with the brushes at this point, right?

So those brushes on your bumper cars might not be all that different from the brushes that are touching the commutators here.

Before the light bulb was invented, people had figured out how to put a reflector behind it, focus it a little bit put lenses in front of it, focus it a little bit better.

So melanin was recruited, in our lineage, and specifically in our earliest ancestors evolving in Africa, to be a natural sunscreen.

So if you have a constant magnetic field and you just by using this commutator which, as soon as you get to that kind of vertical point, it cuts the current, and then when you go a little bit past vertical, a little bit past 90 degrees, it switches the direction of the current.

Your laser printer has a mirror galvanometer that's used to steer a laser beam very accurately that's what makes those little dots on the page.

) Surrounded by a U 238 reflector tamper, the Fat Man's pit was brought close to critical mass by the neutron reflecting properties of the U 238.

In 1876 a French engineer, A. Mangin, invented what has come to be called the Mangin mirror, a concave glass reflector with the silver surface on the rear side of the glass.

So if I put this inside this water here, you can see a silver reflective coating around it, and that silver reflective coating is the layer of air that's protecting the water from touching the paddle, and it's dry.

In a little while he was hard at work again, and the only sounds in the room were the ticking of the clock and the subdued shrillness of his quill, hurrying in the very centre of the circle of light his lampshade threw on his table.

Other methods of geoengineering that is, consciously manipulating the climate include painting the roofs of houses white in order to increase the reflection of sunlight, covering deserts with reflective plastic, and fertilizing the seas with iron in order to increase the absorption of CO2.