Agenda for Wednesday Jan 4th 1.Battery reading page C-34 – C-362.Battery Notes3.Battery Lab (as demo)

Batteries• A battery has two ends – positive terminal and a negative

• Connect the terminals to create a circuit– Creates flow of electrons to produce

electricity• Batteries can be stored because the

chemical process won’t start until the electrons flow

How batteries work• When zinc is inserted into an acid, the acid begins to

eat away at the zinc– The process releases electrons

• If a rod of carbon is inserted into the acid, the acid does nothing to it.

• If you connect the carbon rod to the zinc rod (wire), creating a circuit, electrons will begin to flow through the wire

• When the zinc rod is completely dissolved the battery can no longer be used.

Types of Batteries• Alkaline battery – Duracell® and Energizer®• Lead-acid battery – These are used in cars• Lithium battery –cameras for the flash bulb• Lithium-ion battery – These batteries are found in

laptop computers, cell phones• Nickel-cadmium or NiCad battery • Zinc-carbon battery or standard carbon battery –

regular or standard AA, C and D dry-cell batteries.

Agenda for Thursday Jan 5th 1.Battery readings2.Electrical Appliance Survey

Readings

Read pages C-42 – C43 and answer challenge question

Read C-44 – C46 and answer questions on page C-46

Energy UseYear Energy Used Per Capita

1950 5.3

1955 5.7

1960 5.9

1965 6.5

1970 7.8

1975 7.9

1980 7.5

1985 7.0

1990 8.2

2000 8.9

Electrical Appliance Survey

• Read page C-47 and C-48 and answer the following questions

What kind of energy was required in 1902?What was the main source of energy in 1902?

Electrical Appliance Survey

• Read page C-49 and Page C-50 Answer the following questionsWhat is the message in the old ad? Give two

examples of this message.What is the message in the new ad? Give one

example.How have the ideas of energy changed over time?

Appliance Survey

Page C-51