Origins Explained is the place to be to find all the answers to your questions, from mysterious events and unsolved mysteries to everything there is to know about the world and its amazing animals! 1. Pompeii, Italy There are many scary stories in history, but the story of Pompeii is one that we just can’t get over. This is the city that was built in the fertile valley near a volcano, Mt. Vesuvius. When it erupted, it caught people by surprise and buried the city in soot and ash and left it covered and perfectly preserved for hundreds of years. Now much of it has been uncovered and it is a sad historical marvel and many people were frozen in time forever. 2. Great Zimbabwe, Zimbabwe Sticking with Africa, let's head to Zimbabwe, which holds one of the biggest mysteries of the continent. It's called ... Great Zimbabwe. Yeah, does not really sound mysterious, does it? But don't let that fool you, there's more to this than you might think. 3. Thonis, Egypt If you're bi...
Electric motors can remain very mysterious! How do they use electricity to start rotating? Let's break it down step by step to understand how it works. Topics covered in this video: circuits, current, magnets, electromagnets, armature, commutator, brushes, stator, and rotor. This video only covers DC motors. If you look around your house, you will see many devices that have electric motors, such as kids toys, table fans, toothbrushes, hairdryers, and this electric cutting knife. But how does the electric motor work? You turn it on and somehow it starts rotating. Why is that? Let’s start with something called a circuit. You have a battery, some wires and a device that uses electricity, such as a light bulb. Electricity flows through the circuit. But as soon as there is a break in the wire, the electricity stops flowing and the light bulb goes off. The path must be complete for the circuit to work. This is best down through the use of a switch. Electricity is flowing down the wire. ...