a physic quiz

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it is a physic quiz on website. This test has a time limit of 20 minutes. Some questions on this quiz may involve some calculation. 

there are the summary of this chapter:

Electricity and Magnetism:

              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

 

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