Friday, 23 August 2013

What are some electrical conductors?


-Bookmarked Sci7 Blog.
-Went over Scribe expectations (As well as Scribe Labels)
Investigation - How much energy is in a puffed biscuit and a potato chip? Key
What materials can Electrical Energy Flow Through?

First, we went over our observations for the last investigation. Mr. Pro showed us all possible observations. If we had one he didn't have, he added it to the list. We also went over the energy changes that took place during the investigation (thermal of chip/air --> thermal of test tube--> thermal of water--> thermal of thermometer). He explained how only a small part of the heat actually got transferred into the thermometer.

What Materials can Electrical Energy Flow Through?

After that, Mr. Pro introduced us to our new lab. He said that we were going to try to see what types of materials are electrical conductors. He also said that we were going to test 12 objects, and to see if they work we would look at an ammeter which was connected to a battery. He also
explained why wires had plastic around them (so we wouldn't get electrocuted). Afterwards, we created a hypothesis,we concluded that  "The electrical energy will not flow through non-metalic objects". He then showed us all the materials and asked us to name them. We have to predict if the objects are insulators or conductors, and then test it out. We individually made our predictions and then compared them with our partners. Afterwards, we finally got to actually conduct the experiment. Below are pictures and videos of the investigation.

Some examples of electrical conductors include: Wire, Metals (Gold, Copper, Steel), Water, etc. Insulators include oil, fur, rubber, wood, paper, etc.

If you still don't understand electrical conductors and insulators, check out these sites:
Site 1
Site 2
Site 3

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