1. Electricity

2. What have we learned so far…
Electricity
Used in our everyday lives
Defined as energy carried as electrons, protons, and other subatomic particles
There are two types of electric charges + and -
Opposite charges attract, like charges repel
When positively and negatively charged objects
break each others electric field the electrons
from the negatively charged object to the
positively charged object

3. Continued
Some materials allow electrons to move easily through them – Conductors
Example: Metals
Some materials do not allow electrons to move easily though them – Insulators
Example: Rubber, Plastic, Wood, Glass

4. What do we call the electrical build up on the balloon or from rubbing our feet on the carpet?
Static electricity
Defined as the net accumulation of electric charges on an object

5. We know opposites attract…..
What happens if a negatively charged object comes close to a neutrally charged object?
Charged by Induction

6. Electric Current
An electric current is the flow of electrons through a wire or any conductor
Measured in Amperes (A)
Two keys to having an electric currents
1. Potential Difference
2. Circuit
1. Potential Difference – The difference in potential between two different places
2. Circuit – A closed path through which electrons can flow

7. What does all of this mean?
Recall that thermal energy flows from objects with higher temperatures to objects with lower temperatures
This is similar with electricity, except instead of temperatures we have charges
Greater Potential Energy  Lesser Potential Energy
Potential Energy is measured in Volts (V)

8. What about circuits???
When using electricity you want a continuous flow of electrons through whatever you are trying to power.
If you have a potential difference all you need is a closed path or circuit through which electrons can flow
The flow of electrons through the circuit is called the current

9. What creates the potential difference?
Electrical Outlets
Batteries
Dry Cell
Wet Cell

10. How does a light bulb work?
Light bulbs use resistance to work