Monday, February 1, 2016

Generators

Generators
How is a generator made?
      A generator is very similar to motor just that is the other way around. It is used to convert mechanical energy into electrical energy. To make electric energy you need a copper wire, a magnet and something to power. The copper wire has to be wrapped around the magnet. If the magnet turns it will make the electrons in the wire start flowing around. The electrons flowing through the copper wire create electric energy which will power what you have to power.                                                                                                
How is it similar to a motor?
    A generator is very similar to a motor. It is a motor just that upside down. A motor is used to change electrical to mechanical energy and a generator is made to change mechanical energy into electrical. Both are to transform types of energy into others.


How are generators used in the world around us?
    Generators are used everywhere now a days. Some examples are the dams (hydroelectric plants) that make the water current hit some turbines that create electric energy. Also windmills that are being turned by wind currents are making electric energy. Finally a third example are the small generators used when there are power outages and stuff like that which change the chemical energy from the gasoline to mechanical energy to electric energy so you can have electricity.

Saturday, January 30, 2016

How does a motor work?

How does a motor work?

      A motor is a object that turns electric energy to mechanical energy. This type of motor we made is made of three parts, a neodymium magnet, a copper wire, and a battery. When you connect the wire to the magnet, the magnet to the battery and the battery to the wire. Like energy is flowing to the wire it gets magnetised. When the magnet's magnetic field meats the the wires magnetic field it will push or attract the wire and make it move.





Other motors:
Every motor works very similar for example the one in the side, the electricity running through the copper wire will make it magnetic, so when that magnetic field meats the other one the wire starts to spin.

Monday, January 25, 2016

Electromagnets

Electromagnets

Pre Activity: In the pre activity we saw that the needle (magnet) in the compass always aligned with the battery. The North part of the magnet with the negative side of the battery and the other way around. I think this happens because the battery is electromagnetic which means that it has a magnetic field.

Activity: When we first got the wire to make the electromagnet stronger I thought that I only had to connect the circuit and make the magnetic field be stronger. But obviously this didn't work so we gave the wire 16 loops around the medium sized nail but it's magnetic force still wasn't. After that we tried to change the nail to a bigger one and we changed the wire to one that looked more like copper, and looped it 15 times around the nail but this time the force was even less because it didn't attract the compases needle. Finally we went back to the original wire and but kept the big nail so we could wrap it a lot more times. So we wrapped the wire it 36 times around the nail and the magnetic force grew a lot, so when we tried to pick up a paper clip using that magnetic force we ended up picking up 3 paper clips at the same time. But then we dropped the nail and after that we could only pick up one paper clip. The drop made it loose some magnetism. 

Some factors that influence the strength of the electro magnet are how many times the wire is looped around the nail and which wire you use. The more loops you give the wire the more magnetic force it will have.

Rube Goldberg Machine