1. Warm Up #15
In which direction do electrons flow in a circuit powered by a battery?

2. Lesson 3: Describing circuits
Ch. 9 Electricity
Lesson 3: Describing circuits

3. Essential Questions What are the basic parts of electric circuits?
How do the 2 types of electric circuits differ?

4. Parts of an electric circuit
Common parts of most electric circuits:
Source of electric energy (typically a battery)
Electrical devices that transform electric energy
Conductors that connect to other components
BrainPop – Electric Circuits

5. Series and parallel circuits
Series circuit - an electric circuit, with only 1 path for an electric current to follow
What are some examples of series circuits?

6. Series and parallel circuits
How do series and parallel circuits differ?
What is the smallest number of paths for a parallel circuit?
How would removing devices from a parallel circuit affect the current?

7. Series and parallel circuits
Parallel circuit – an electric circuit with more than one path, or branch, for an electric current to follow
What are some examples of parallel circuits?

8. Electric circuits in the home
Too many branches or devices to a parallel circuit increases the current through the source creating dangerously high currents in the circuit
Every home has fuses and circuit breakers to help protect a circuit in a home

9. Electric safety Never use electrical devices with damaged power cords
Stay away from water when using electrical devices plugged into an outlet
Avoid using extension cords and never plug more than 2 home appliances into an outlet at once
Never allow any object that you are touching to contact electric power lines, such as a kite string or a ladder
Don’t touch anyone or anything that is touching a downed electric wire
Never climb utility poles or play on fences surrounding electricity substations

10. Review Series and Parallel Circuits worksheets
How does the electric current change when more devices are added to a series circuit? To a parallel circuit?