Lets Review Which of the objects has a

Let’s Review:

Which of the objects has a “Total” negative charge?

Which of the objects has a “Total” positive charge?

Which of the objects has a “Total” neutral charge?

How did “B” become positive? A. B. C. D. Gaining protons Losing protons Gaining electrons Losing electrons

How did “C” become negative? A. B. C. D. Gaining protons Losing protons Gaining electrons Losing electrons

Electric Circuits

What is an Electric Circuit? • An Electric Circuit is a closed path through which electricity flows.

Electric Circuits • There are 3 parts to any Electric Circuit: 1. Energy Source 2. Energy Conductor 3. Energy Receiver

Energy Source Energy Receiver(resistance) Energy Conductor

What does it take to make an “electric device” work? My IPOD won’t come on!!! You silly Brit, you probably forgot to “charge” it!!

In order to work properly, electricity has to get : 1. To the device 2. Through the device 3. And back to the other side of the battery(or outlet)

Investigate Open and Closed Circuits: • 1 st you have to understand what a “Switch” is and what a “Switch” does!!

Open Switch • Electricity can’t move through. • Device will not work properly!! • Called an Open Circuit!! Closed Switch • Electricity can move through. • Device will work properly. • Called a Closed Circuit!!

Current will not flow in the circuit below. What must occur in order for the light bulb to turn on? A. Connect the battery B. Replace the lightbulb C. Close the switch D. Open the switch

Using Ohm’s Law and the Power Equation with Simple Circuits: 3 W 9 V I - ? ? ?

V= 2 A 8 W V = 16 V

12 V R= I=2 A

12 V I=2 A P = ? ? ?

What is the current in the circuit below? A. B. C. D. . 5 A 2 A 12. 5 A 7. 5 A 2. 5 V 5 W

What is the Potential Difference of the battery below? A. B. C. D. . 5 V 2 V 15 V 50 V I=5 A 10 W

What Power is consumed by the circuit below? A. B. C. D. 10 W 50 W 250 W 500 W V = 50 V I=5 A 10 W

Independent work: p. 205 #6, 7 p. 836 #76 – 89 **Turn In!!!!** www. explorelearning. com **Build some circuits and turn on the lights!!