1. Ohms law, series circuit Wednesday, February 17, 2016

2. What is the electrostatic force between two objects, +10 μC and –12 μC which are 0.60 m apart? Will the charges be attracted to each other or will they repel each other Upcoming dates:  Friday, 2/12 – Statics quiz – moved to Wednesday, 2/17  Wednesday, 2/17 – Series circuit quiz – moved to Friday, 2/19  Friday, 2/19 – Parallel circuit quiz – moved to Tuesday, 2/23  Tuesday, 2/23 – Circuit design due  Thursday, 2/25 – Unit quiz  Monday, 2/29 – Electricity Test and missing work deadline  Friday, 3/4 – Magnetism quiz  Friday, 3/4 – 3NWS Extra credit due by 4:00 PM  Thursday, 3/10 – Waves Quiz  Friday, 3/11 – End of the 3NWS Unit 9: Electricity Tuesday, 2/16

3. What is the electrostatic force between two objects, +10 μC and –12 μC which are 0.60 m apart? Will the charges be attracted to each other or will they repel each other G: q 1 = 10 x 10 -6 CE: q 2 = -12 x10 -6 C d = 0.60 m K c = 9.00 x 10 9 N*m 2 /C 2 S: F electric = (9.00 x 10 9 ) ((10 x 10 -6 )(-12 x10 -6 )) (0.60) 2 U: F electric S: F electric =

4. Quiz  When you are finished turn your paper over.  You will have 15 minutes to complete the quiz.

6. Electric Current  The continuous flow of electrons through a conducting metal.

7. Alternating Current  Flow of current that periodically changes direction  Produced in power plants  Current from a wall outlet changes direction 120 times per second

8. Direct Current  The flow of current in one consistent direction  Examples  Batteries  Solar cells  Current from a battery travels from the positive terminal to the negative terminal.

9. Common Language

10. Note Taking Guide QuantitySymbolDefinitionUnitMeasuring Device voltage current resistance

11. Voltage  Voltage (V) (also know as Potential Difference) can be thought of as the force pushing electric charges along a conductor. It is the energy in the circuit  Measured in Volts (V)

12. a device that measures electric potential difference, must be connected in parallel

13. Current  Electric current (I) is the movement of electric charge in a conductor (rate at which the electrons are flowing)  Measured in Amps (A)

14. Ammeter a device that measures current attached in series

15. Resistance  Resistance (R) is a measure of how difficult it is to push the charges along.  The energy is transformed at the resistor (potential energy is converted).  Examples: light bulb, charging your phone, making coffee, etc.  Measured in Ohms (   An Ohmmeter is used to measure resistance in a system.

16. Note Taking Guide QuantitySymbolDefinitionUnitMeasuring Device voltageVEnergy in the circuitVoltsVoltmeter currentIRate of flowAmpsAmmeter resistanceROpposes current; energy transforms OhmsΩOhmmeter

17. Ohm ’ s Law  Ohm's Law analyzes the relationship between voltage and current in an ideal conductor.  Ohm's Law is given by:  V = I * R

18. Example A flashlight that is powered by 3 volts and uses a bulb with a resistance of 60 ohms. What is the current flowing through the circuit?

19. Example A flashlight that is powered by 3 volts and uses a bulb with a resistance of 60 ohms. What is the current flowing through the circuit? G: V = 3 voltsE: V = (I)(R) S: 0/05 Amps R = 60 Ω S: 3 = (I)(60) U: I

20. Practice

21. Cool Down  What is the difference between static and current electricity?

23. Resistors can be connected in series; that is, the current flows through them one after another. Series Circuits

24. Kirchhoff’s Rules Loop Rule: The sum of the potential differences (voltage) around any closed circuit loop is zero.

25. Kirchhoff’s Rules Loop Rule: The sum of the potential differences (voltage) around any closed circuit loop is zero.

26. SeriesSeries Circuit Series 1. total resistance is the sum of the separate resistors separate resistors R T = R 1 + R 2 + R 3 +... 2. current is the same through each resistor I T = I 1 = I 2 = I 3 =... 3. total potential difference is the sum of each V T = V 1 + V 2 + V 3 +... In other words, in a series circuit, resistance and voltage add, but current stays the same.

27. Series Circuit Example

28. Series Circuit Practice

29. Series Circuit - Simulation