Cost of running light bulb for 8 hours at 22¢ kw/hr
Coffee maker 
Cost of running coffee maker for thirty minutes at 22¢ kW/hr
Wednesday, February 26, 2014
Thursday, February 13, 2014
IPad Batteries
http://electronics.howstuffworks.com/everyday-tech/lithium-ion-battery1.htm
What was included in the article?
This article talked about how the lithium ion battery works. In explaining the parts of tha battery, it said there was a voltage converter and regulator circuit, which relates to class. This is used to maintain safe levels of voltage. It also explained that there is a postive electrode, a negative electrode, and a separator. When the battery charges, ions of lithium move through the separator from the positive electrode to the negative,and attach to the carbon. These lithium ions move at a very high voltage.
What did I learn in class that helped me to understand?
Our discussions on voltage helped a lot in understanding this article. It was helpful to know that energy is stored when a charge is placed at a voltage. A voltage being a buildup of charge. It was also helpful to know that in a normal battery electrons are given electric potential energy from the voltage of the battery. This energy is then converted into other forms. The iPad battery also uses a similar process as the iPad will also take the electric potential energy of the electrons and convert it.
Monday, February 10, 2014
Charge Transfer and Interaction
Most everything starts off neutral. When I rub the balloon on my hair, my hair sends electrons to the balloon. The balloon gains electrons and becomes negative while my hair loses electrons and becomes positively charged.
How does the balloon attract neutral water?
The hydrogen atoms are positive while the oxygen atoms are negative in a water molecule. The water molecules realign themselves to put the positive towards the negatively charged ballon. The molecules are now polarized, or separated. The stream of water alters it path closer to the balloon as it is attracted to it due to opposite charges.