a physic quiz

•              Protons and Electrons have a property called Charge, which makes them attract and repel. This is called the Electric or Electrostatic Force.

•              When Charges move around, we refer to it as Electric Currents.

•              The Voltage of the Electricity is related to the Energy of the moving Charges, and the Current is related to their number.

•              When Current flows through a material, some Energy is lost and changed to Heat. This is called Resistance.

•              Unless the material is a Superconductor, which have no Resistance.

•              Moving Charges (Currents) experience another force called the Magnetic Force.

•              In a Permanent Magnet, the moving charges are due to the microscopic motion of Electrons

•              In most materials, the motion of the Electrons is random. If the Electrons move in the same direction, you get a Magnet

•              When a Magnetic material (such as Iron) is placed near a Magnet, the Electron motion aligns, the material temporarily becomes a Magnet, and it is attracted.

•              Ordinary Electric Currents also act like Magnets, and are called Electromagnets

•              Electric Motors convert Electrical Energy to mechanical motion

•              Electric Generators convert mechanical motion to Electrical Energy

•              Transformers change the Voltage of Electricity

•              Magnets can be used for applications such as Magnetic Recording (computer hard drives) and Rail Guns