1. Chapter 33 Electric Fields And Potential And Ohm’s Law

2. Just as the space around Earth and every other mass is filled with a gravitational field, the space around every electric charge is filled with an electric field.

4. Just as gravitational forces hold a satellite around the earth. Electrical forces hold an electron in orbit around a nucleus.

5. Electric field The area around a charged object. This field exerts a force on any charged object in its vicinity. The closer the charged object is brought to the charged object creating the field, the greater the force exerted on it.

6. An electric field has magnitude and direction. So it is a …….

7. Vector Its magnitude (strength) can be measured by its effect on charges located in the field.

8. Electric field lines The electric field can be represented with electric field lines. The closer the lines are, the stronger the field is.

10. electric field lines point in the direction which a positive test charge would accelerate if placed upon the line.

11. Field lines are always directed from the positive charge and toward a negative charge.

13. Electric Potential Energy: The energy a charge possesses by virtue of its location

14. Electric Potential work done on a charge; or the electric potential is the potential energy per unit charge (symbol is V; SI unit is volt)

15. Electric Potential = Electrical potential energy / charge

16. Potential = work / test charge or V = W / q o

17. Remember, the term “work” can be replaced with the term “energy” because to store energy in, or to give energy to, an object, work must be done.

18. 1 volt = 1 Joule / coulomb

19. Capacitor a device that stores charge in the electric field between its plates. Each plate carries the same amount of charge, one plate being negative and the other being positive. A potential difference exists between the two plates.

20. Capacitors are found in almost all electronic circuits

21. Ohm’s Law Georg Simon Ohm discovered that the current in a circuit is directly proportional to the voltage impressed across the circuit and is inversely proportional to the resistance of the circuit

22. Current = voltage / resistance I = V / R Current (I) – amperes Potential Difference (V) – volts Resistance (R) - ohms

23. Read page 525 Page 526 has pictures of different capacitors