Materials needed for each student pair for this ppt.

1
Materials needed for each student pair for this
ppt.s activities

• 4 wires about 4 inches long with both ends
  stripped off
• 1 small light bulb
• 3 more small light bulbs in holders, or 3 holiday
  lights with about 4 inches of wire on either side
  of the bulb, and each end of the wire stripped
  off. ( I like to demo with bulbs in holders,
  but let the students work with holiday lights.
  It is easier for them to handlebut they must be
  exposed to the holders as that is usually what is
  on the state tests.
• 2 batteries, one in a holder and one not in a
  holder for the activity mentioned in slide 2
• 1 large light bulb with the glass broken so
  students can see inside the light bulb

2
Electric Energy
3
To make a light bulb light up, you must have
three things

• Energy source (for us, a battery)
• Something for the energy to travel on (usually a
  metal wire with plastic/rubber covering for
  insulation)
• Something to use the energy (light bulb, motor,
  door bell, etc.)

4
Batteries Our Energy Source

• There are many different types of batteries

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5
What Happens Inside a Battery

• In a battery, electrons want to move from the
  negative end of the battery to the positive end
  of the battery. They can not move inside the
  battery. The electrons MUST come out of the
  negative end of the battery and back into the
  positive end of the battery.

6
What Happens Inside a Battery (continued)

• But they will not come out unless they can get
  back into the battery to get recharged.

Honey, I am not leaving until I know I can get
back in again!!!
7
So we use wires for the electrons to travel on....
What Happens Inside a Battery (continued)
8
When the electrons can travel in and out of the
battery, it is called an electric current.
What Happens Inside a Battery (continued)
9
But we are wasting energy...why???
10
We must put something on the current to use the
energy...not waste it!
11
Will it work?
12
MUCH BETTER!!!
13
Will it work?
14
Will it work?
15
Will it work?
16
Will it work?
17
Types of Circuits

• Complete or closed circuit All parts of the
  circuit are connected, so the light bulb works.

18
Now you make an closed or complete circuit
with one battery in a holder two wires
one light bulb
19
Types of Circuits

• Incomplete or open circuit Some part of the
  circuit is not connected, so the light bulb does
  not work.

20
Now you make an open or incomplete circuit
with one battery in a holder two wires
one light bulb
21
Single circuit a complete circuit with only one
object on the circuit.
22
Series circuit a complete circuit with more than
one object on the circuit, all located in a
single line.
23
Another example of a series circuit using a door
bell and a light bulb.
24
Now you make a series circuit with one
battery in a holder three wires two light
bulbs
25
Will this work?
26
Add one more light to your series circuit so you
have three lights. What happens to the
brightness of the bulbs?
27
On a series circuit, all objects MUST SHARE the
energy in the battery, so the more objects you
add, the dimmer the light becomes.
28
Disconnect one of the bulbs. What happens to
the other bulbs?
29
Now make a parallel circuit like the one
below.Notice how bright the bulbs burn.This
is because each bulb has its own pathway to the
batteries energy.
30
Disconnect one of the bulbs. What happens to
the other bulbs?