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1 Electricity NEW the BIG idea Moving s transfer energy Charges can move from one place to another. 5.3 Electric current is a flow of charge.

2 Electric charge is a property of matter. Electrons have a negative charge.

3 Electric charge is a property of matter. Protons have a positive charge.

4 Electric charge is a property of matter. Unlike charges attract.

5 Electric charge is a property of matter. Like charges repel.

6 Static charges are caused by the movement of electrons, resulting in an imbalance of positive and negative charges. At first, a balloon and a glass rod each have balanced, neutral charges.

7 Static charges are caused by the movement of electrons, resulting in an imbalance of positive and negative charges. When they touch, electrons move from the rod to the balloon.

8 Static charges are caused by the movement of electrons, resulting in an imbalance of positive and negative charges. Afterwards, the balloon has a negative charge, and the rod has a positive charge.

9 Static charges are caused by the movement of electrons, resulting in an imbalance of positive and negative charges. SIMULATION Learn more about static electricity.

10 5.2 Charges can move from one place to another. Charge movement is affected by electric potential, measured in volts resistance, measured in ohms A conductor has low resistance. An insulator has high resistance. A ground is the path of least resistance. 3. The ground wire conducts the charge into the ground, where it spreads out and becomes harmless. 1. Lightning strikes the lightning rod, because the rod is the path of least resistance. 2. The rod conducts the charge to a conductor cable, which has low resistance. electric potential volt conductor insulator resistance ohm grounding

11 5.3 Electric current is a flow of charge. Electric current is measured in amperes, or amps. Ohm's law states that current equals voltage divided by resistance. electric current ampere Ohm s law electric cell Voltage Current = Resistance I = V R Electrochemical cells produce electric current through chemical reactions.

12 5.3 Electric current is a flow of charge. Electric current is measured in amperes, or amps. Ohm's law states that current equals voltage divided by resistance. electric current ampere Ohm s law electric cell Voltage Current = Resistance I = V R SIMULATION See Ohm s law in action. Electrochemical cells produce electric current through chemical reactions.

13 I. A. Electric charge is a property of matter. B. Static charges are caused by the movement of electrons. 1. Charging by Contact 2. How Materials Affect Static Charging 3. Charging by Induction 4. Charge Polarization C. Technology uses static electricity. SUMMARY

14 5.2 Charges can move from one place to another. II. Charges can move from one place to another. A. Static charges have potential energy. 1. Electric Potential Energy 2. Electric Potential 3. Charge Movement 4. Lightning B. Materials affect charge movement. 1. Conductors and Insulators 2. Resistance 3. Superconductors 4. Grounding electric potential volt conductor insulator resistance ohm grounding SUMMARY

15 5.3 Electric current is a flow of charge. III. Electric current is a flow of charge. A. Electric charge can flow continuously. 1. Current, Voltage, and Resistance 2. Ohm s Law 3. Measuring Electricity B. Electric cells supply electric current. 1. Electrochemical Cells 2. Solar Cells electric current ampere Ohm s law electric cell SUMMARY

16 Chapter Resources Image Gallery Click here to view chapter images and animations Click on the items below to access resources on CLASSZONE.COM Resource Centers Get more information on select science topics Math Tutorial Review math concepts Content Review Review key concepts and vocabulary Standardized Test Practice Practice state standardized tests BACK TO

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