I was not happy with this mark. I believe that if I had more time to complete this task I would have reached a higher mark.

 
 

I am happy with my mark although I should have written more in the response questions to the prac.

 
 

I am happy with my mark although I should have studied a bit more for the experimental design section.

 
 
The effectiveness of furniture polish at keeping germs at bay.
Before: 70%
After:40%
Effectiveness = 30%
 
 
 
 
I have to pay $11.75 for using the PlayStation 3 for 2 hours a day for every day in a year. To find this I first found the wattage of a ps3 which is 70. The electricity cost is 23 cents/kwh. Running time per day is 2 hours. Per year is 2 x 365 so per year is 730 hours. 730 hrs x 70w equals 51,100. 51,100 divided by 1000 is 51.1 kwh. 51.1 x 23 cents equals 1,175 cents divided by 100 equals $11.75 per year.
 
 
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This is a flowchart showing how electricity moves from coal to houses, buildings etc.
 
 
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A voltmeter measures the electrical potential difference between two points in an electric circuit.
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What is the relationship between voltage and current? Ohm's law applies to electrical circuits; it states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them. Or simply V = I*R Note that Ohm's law apply only to ohmic materials i.e. Materials which obey ohm's law. Not all materials follow this V = I*R relationship. Ref: http://answers.yahoo.com/question/index?qid=20090420163630AAFGtrK
 
 
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An ammeter measures amperes or flow of current through the circuit.
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First connect the ammeter to the electric circuit. Ammeters usually have screw connectors either at the top or at the back of it. Now, Connect the wires to the positive and negative screws and tighten it. Now you can see the reading. Reference: http://how-to.ask.com/other/how_to_read_an_ammeter
 
 
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This is a parallel circuit which means that if one light goes out the rest will go out.
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This is a series circuit which means that if one light goes out, the other lights will go out too.